NoSQL数据库Mongodb副本集架构（Replica Set）高可用部署
NoSQL数据库Mongodb副本集架构（Replica Set）高可用部署
作者：尹正杰
版权声明：原创作品，谢绝转载！否则将追究法律责任。
MongoDB 是一个基于分布式文件存储的数据库。由 C++ 语言编写。旨在为 WEB 应用提供可扩展的高性能数据存储解决方案。MongoDB 是一个介于关系数据库和非关系数据库之间的产品，是非关系数据库当中功能最丰富，最像关系数据库的。
Mongodb是时下流行的NoSql数据库，它的存储方式是文档式存储，并不是Key-Value形式。关于Mongodb的特点，这里就不多介绍了，大家可以去看看官方说明:https://docs.mongodb.com/manual/。mongodb有几种部署方式（Replica Set / Sharding / Master-Slaver），这里采用的是副本集架构（Replica Set）。这种部署方式也是生成环境经常使用的，如果你对其它的部署方式感兴趣的话大家可以去自行百度。
一.架构介绍
为了防止单点故障就需要引副本（Replication），当发生硬件故障或者其它原因造成的宕机时，可以使用副本进行恢复，最好能够自动的故障转移（failover）。有时引入副本是为了读写分离，将读的请求分流到副本上，减轻主（Primary）的读压力。而Mongodb的Replica Set都能满足这些要求。
Replica Set的一堆mongod的实例集合，它们有着同样的数据内容。包含三类角色：
主节点（Primary）：接收所有的写请求，然后把修改同步到所有Secondary。一个Replica Set只能有一个Primary节点，当Primary挂掉后，其他Secondary或者Arbiter节点会重新选举出来一个主节点。默认读请求也是发到Primary节点处理的，需要转发到Secondary需要客户端修改一下连接配置。
副本节点（Secondary）：与主节点保持同样的数据集。当主节点挂掉的时候，参与选主。
仲裁者（Arbiter）：不保有数据，不参与选主，只进行选主投票。使用Arbiter可以减轻数据存储的硬件需求，Arbiter跑起来几乎没什么大的硬件资源需求，但重要的一点是，在生产环境下它和其他数据节点不要部署在同一台机器上。
注意，一个自动failover的Replica Set节点数必须为奇数，目的是选主投票的时候要有一个大多数才能进行选主决策。
由图可以看到客户端连接到整个副本集，不关心具体哪一台机器是否挂掉。主服务器负责整个副本集的读写，副本集定期同步数据备份，一但主节点挂掉，副本节点就会选举一个新的主服务器，这一切对于应用服务器不需要关心。我们看一下主服务器挂掉后的架构：
副本集中的副本节点在主节点挂掉后通过心跳机制检测到后，就会在集群内发起主节点的选举机制，自动选举一位新的主服务器。
二.准备环境
1>.操作系统环境
准备3台配置完全一致的虚拟机（当然IP的配置不能相同！）。内存分配4G即可，主机名需要提前配置好，我的配置环境如下：
2>.各个主机配置免密登陆（在“node101.yinzhengjie.org.cn”上操作）
[root@node101 ~]# ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa Generating public/private rsa key pair. Created directory '/root/.ssh'. Your identification has been saved in /root/.ssh/id_rsa. Your public key has been saved in /root/.ssh/id_rsa.pub. The key fingerprint is: d1:90:58:b3:ca:97:0e:91:f2:15:23:73:7d:05:d4:53 root@node101.yinzhengjie.org.cn The key's randomart image is: +--[ RSA 2048]----+ | ooBo .o+..E| | .=.B. . o | | . o + .. . | | + + o | | = S | | + | | . | | | | | +-----------------+ [root@node101 ~]# [root@node101 ~]# [root@node101 ~]# [root@node101 ~]# [root@node101 ~]# ll ~/.ssh/id_rsa -rw-------. 1 root root 1675 Dec 5 02:35 /root/.ssh/id_rsa [root@node101 ~]# [root@node101 ~]# cat ~/.ssh/id_rsa -----BEGIN RSA PRIVATE KEY----- MIIEogIBAAKCAQEAwtFCswPu3AOKXa2TzJRBKG/LC8knCtLE54zMVUaMwbWH0fdV xHpa8n+V15W3HwLFBZDgyNmnPvZkVJUvTYqf5QaLsxm5J0JAxlmBkY/ayByeULLw SVIXM/hqBulYnbUViVhGEmBbpI3ASjFVXQyiihyNhzoPZBjdiexnTh7aYJDjQ8qL IZyQu+rjeoqju839dUmm4RfmqgaPsa717CNxqUgUdviTdK2meV4hA7HtKAxMTpYK JcEAu3lvh9NRT2k8HSMvEaN/WVUF8SrNN1oUC4aFSO9tDmY3euBCccYf+RqSlzys m5dxCFDk94cEhsvIzfdzUB4usPs1inUHcQ9pqQIDAQABAoIBAAWbPA4myNLwDyVO /3fdtFpTjUZTjZoUIrJ/LMovc5GHhdcXBRLYapGb9lXz6wcrbzwPxUhCazu2n4CH oorauGtA2vhWfyuQDokmvkHQH/2uRSgRXjTd9ej69yInyPMQ6QPA1JNmznxXz/bS oKBC4tKSq8f+db7tsEJt2TM4VBR/Sg0x77LhZA70MC2+vv+9AoIKVVdZ/KNud+Dk r2c+Hmo4r7I4G2Oqaj33f7RXFsILIwl0SBvpag4GPhwnOuphXDr3DQ1v5j+4x0rx 3JE+HmlpU66XveUuy7pMurdbOCajwPQgLkDo5W7bBUMIlBS/nZvInncVdDPzWFHO ZlUh8dkCgYEA6Ykewa0oN96XLPdqbADHRqpzxL7zXJJ644Hh2HygyhR0xw3bOI57 IjkYje9e5PVUcXWuOj/oOMfKal2jW/78bnEgukX1JgkX8RHT9zsgZ0AGEpquHkjv NrB1qrdbEwnNpSLB8pwGveD9zf89yzocZE+5CUBfnsuAgZqPYkjPMwcCgYEA1Y6x o1ZxxsPGZIk+hZPuynemdZYnQWp3Z9ynVv902x1/sxcn/uZ+0DZDLQbqGA+2WdEg EQZ9BwKTCkThoPBJKEzR3Ck122ahqSKCEQRGwK0h05uaA3KSTGIbujGaoBfDWG6f 3fTSWZnTNaObmcOhxTgsMRegy/kWOIgYqdX04c8CgYA9rsf+49uBljtb1yW2zSXV VmQpjT3+L3ph6QZcBd76QRjvEovajlebnHUN2DG6S8o4BZs1K3gMt0iRe5YQUHMg QKUiTiQIHdLDC7Bu1qEiZFi2RUDEIwN78HPD2ZYmmypD+cA8clWdhXXEGSybJwgk vqHi/avD54BTux0wGocPtQKBgFY2Ud4nsqzUMg46HaRdUSQpY2jK4jQVX/js6h1D 6Y/fe8L30SylLoKttTbDONPX2/ysYO6emPCwiF236wJGnrIHOR1RAa3947tc8/cc q9dyzVoY0fccVJVDcgAbsFl63mCf4CgBgr2rTMm1r8ZGZNMyVxzGdiKB/wd5YcOG XWKfAoGAYpvjXzEYzr7Y7KKlZBR3gUZZwfngYYgf8g1L42oB1un1NUajiMCyPsm6 oxKrFj6a8SH1xy1U0S7QbPK7osjR5qU7SMsqgziouBl1UmAT5WVKoik4UvHLlKC3 hB0HxUvfVYM5lV3BaggVTC/EOAOsa+jqfbrwjBxjn/kmmv2FtLk= -----END RSA PRIVATE KEY----- [root@node101 ~]# [root@node101 ~]#
[root@node101 ~]# ssh-copy-id root@node101.yinzhengjie.org.cn The authenticity of host 'node101.yinzhengjie.org.cn (172.30.1.101)' can't be established. ECDSA key fingerprint is e5:24:dc:52:ee:e6:ed:83:de:45:39:a8:c4:14:27:e7. Are you sure you want to continue connecting (yes/no)? yes /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed /usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys root@node101.yinzhengjie.org.cn's password: Number of key(s) added: 1 Now try logging into the machine, with: "ssh 'root@node101.yinzhengjie.org.cn'" and check to make sure that only the key(s) you wanted were added. [root@node101 ~]# [root@node101 ~]# ssh node101.yinzhengjie.org.cn Last login: Wed Dec 5 02:42:08 2018 from 172.30.1.2 [root@node101 ~]# who root pts/0 2018-12-05 02:42 (172.30.1.2) root pts/1 2018-12-05 02:49 (node101.yinzhengjie.org.cn) [root@node101 ~]# [root@node101 ~]# logout Connection to node101.yinzhengjie.org.cn closed. [root@node101 ~]#
[root@node101 ~]# ssh-copy-id root@node102.yinzhengjie.org.cn /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed /usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys root@node102.yinzhengjie.org.cn's password: Number of key(s) added: 1 Now try logging into the machine, with: "ssh 'root@node102.yinzhengjie.org.cn'" and check to make sure that only the key(s) you wanted were added. [root@node101 ~]# [root@node101 ~]# ssh node102.yinzhengjie.org.cn Last login: Wed Dec 5 02:51:08 2018 from 172.30.1.101 [root@nod102 ~]# [root@nod102 ~]# who root pts/0 2018-12-05 01:29 (172.30.1.2) root pts/1 2018-12-05 02:51 (172.30.1.101) [root@nod102 ~]# [root@nod102 ~]# logout Connection to node102.yinzhengjie.org.cn closed. [root@node101 ~]#
[root@node101 ~]# ssh-copy-id root@node103.yinzhengjie.org.cn /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed /usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys root@node103.yinzhengjie.org.cn's password: Number of key(s) added: 1 Now try logging into the machine, with: "ssh 'root@node103.yinzhengjie.org.cn'" and check to make sure that only the key(s) you wanted were added. [root@node101 ~]# [root@node101 ~]# ssh node103.yinzhengjie.org.cn Last login: Wed Dec 5 02:52:15 2018 from 172.30.1.101 [root@node103 ~]# [root@node103 ~]# [root@node103 ~]# who root pts/0 2018-12-05 01:27 (172.30.1.2) root pts/1 2018-12-05 02:52 (172.30.1.101) [root@node103 ~]# [root@node103 ~]# logout Connection to node103.yinzhengjie.org.cn closed. [root@node101 ~]#
3>.编写集群管理脚本
在配置FQDN和免密钥登陆后，咱们就可以编写一些集群的管理脚本，便于我们下发文件到其他节点中。
[root@node101 ~]# vi /usr/local/bin/xcall.sh #我们创建该脚本时，直接就把它放在默认的“PATH”环境变量中。因此编辑好后只要有执行权限就可以在任意路径调用它啦！ [root@node101 ~]# [root@node101 ~]# [root@node101 ~]# cat /usr/local/bin/xcall.sh #!/bin/bash #@author :yinzhengjie #blog:http://www.cnblogs.com/yinzhengjie #EMAIL:y1053419035@qq.com #判断用户是否传参 if [ $# -lt 1 ];then echo "请输入参数" exit fi #获取用户输入的命令 cmd=$@ for (( i=101;i<=103;i++ )) do #使终端变绿色 tput setaf 2 echo ============= node${i}.yinzhengjie.org.cn : $cmd ============ #使终端变回原来的颜色，即白灰色 tput setaf 7 #远程执行命令 ssh node${i}.yinzhengjie.org.cn $cmd #判断命令是否执行成功 if [ $? == 0 ];then echo "命令执行成功" fi done [root@node101 ~]# [root@node101 ~]# [root@node101 ~]# chmod +x /usr/local/bin/xcall.sh #别忘记添加执行权限哟！ [root@node101 ~]# [root@node101 ~]# xcall.sh cat /etc/redhat-release #我们在这里可以测试一些咱们的脚本是否好使～ ============= node101.yinzhengjie.org.cn : cat /etc/redhat-release ============ CentOS Linux release 7.2.1511 (Core) 命令执行成功 ============= node102.yinzhengjie.org.cn : cat /etc/redhat-release ============ CentOS Linux release 7.2.1511 (Core) 命令执行成功 ============= node103.yinzhengjie.org.cn : cat /etc/redhat-release ============ CentOS Linux release 7.2.1511 (Core) 命令执行成功 [root@node101 ~]# [root@node101 ~]#
[root@node101 ~]# xcall.sh "yum -y install rsync" ============= node101.yinzhengjie.org.cn : yum -y install rsync ============ Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.huaweicloud.com * extras: mirrors.huaweicloud.com * updates: mirrors.163.com Resolving Dependencies --> Running transaction check ---> Package rsync.x86_64 0:3.1.2-4.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: rsync x86_64 3.1.2-4.el7 base 403 k Transaction Summary ================================================================================ Install 1 Package Total download size: 403 k Installed size: 815 k Downloading packages: Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : rsync-3.1.2-4.el7.x86_64 1/1 Verifying : rsync-3.1.2-4.el7.x86_64 1/1 Installed: rsync.x86_64 0:3.1.2-4.el7 Complete! 命令执行成功 ============= node102.yinzhengjie.org.cn : yum -y install rsync ============ Loaded plugins: fastestmirror Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast http://mirrors.njupt.edu.cn/centos/7.6.1810/os/x86_64/repodata/bc140c8149fc43a5248fccff0daeef38182e49f6fe75d9b46db1206dc25a6c1c-c7-x86_64-comps.xml.gz: [Errno 12] Timeout on http://10.10.254.10/cache/5/02/mirrors.njupt.edu.cn/033b2636ff3cf3103169fa739764fdd7/bc140c8149fc43a5248fccff0daeef38182e49f6fe75d9b46db1206dc25a6c1c-c7-x86_64-comps.xml.gz: (28, 'Connection timed out after 30682 milliseconds') Trying other mirror. http://mirrors.njupt.edu.cn/centos/7.6.1810/updates/x86_64/repodata/8e273c72093a2cfc3f3b2baccfb2b01f7f4bcdc1bb72d53e38074068a756f1c6-primary.sqlite.bz2: [Errno 12] Timeout on http://10.10.254.10/cache/4/02/mirrors.njupt.edu.cn/c35de49cce30395fb97f6c41a56fbad5/8e273c72093a2cfc3f3b2baccfb2b01f7f4bcdc1bb72d53e38074068a756f1c6-primary.sqlite.bz2: (28, 'Connection timed out after 30672 milliseconds') Trying other mirror. Determining fastest mirrors * base: mirrors.huaweicloud.com * extras: mirrors.huaweicloud.com * updates: mirrors.neusoft.edu.cn Resolving Dependencies --> Running transaction check ---> Package rsync.x86_64 0:3.1.2-4.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: rsync x86_64 3.1.2-4.el7 base 403 k Transaction Summary ================================================================================ Install 1 Package Total download size: 403 k Installed size: 815 k Downloading packages: Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : rsync-3.1.2-4.el7.x86_64 1/1 Verifying : rsync-3.1.2-4.el7.x86_64 1/1 Installed: rsync.x86_64 0:3.1.2-4.el7 Complete! 命令执行成功 ============= node103.yinzhengjie.org.cn : yum -y install rsync ============ Loaded plugins: fastestmirror Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast http://mirrors.njupt.edu.cn/centos/7.6.1810/os/x86_64/repodata/6614b3605d961a4aaec45d74ac4e5e713e517debb3ee454a1c91097955780697-primary.sqlite.bz2: [Errno 12] Timeout on http://10.10.254.10/cache/5/02/mirrors.njupt.edu.cn/fa6cd86bdbaedbbfedfbfa6d45952cd2/6614b3605d961a4aaec45d74ac4e5e713e517debb3ee454a1c91097955780697-primary.sqlite.bz2: (28, 'Connection timed out after 30867 milliseconds') Trying other mirror. Determining fastest mirrors * base: mirrors.huaweicloud.com * extras: mirrors.huaweicloud.com * updates: mirrors.cn99.com Resolving Dependencies --> Running transaction check ---> Package rsync.x86_64 0:3.1.2-4.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: rsync x86_64 3.1.2-4.el7 base 403 k Transaction Summary ================================================================================ Install 1 Package Total download size: 403 k Installed size: 815 k Downloading packages: Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : rsync-3.1.2-4.el7.x86_64 1/1 Verifying : rsync-3.1.2-4.el7.x86_64 1/1 Installed: rsync.x86_64 0:3.1.2-4.el7 Complete! 命令执行成功 [root@node101 ~]#
[root@node101 ~]# vi /usr/local/bin/xrsync.sh #编写同步脚本，注意：我们在编写脚本时，就把脚本放在Linux自带的“PATH”环境变量中。 [root@node101 ~]# [root@node101 ~]# cat /usr/local/bin/xrsync.sh #!/bin/bash #@author :yinzhengjie #blog:http://www.cnblogs.com/yinzhengjie #EMAIL:y1053419035@qq.com #判断用户是否传参 if [ $# -lt 1 ];then echo "请输入参数"; exit fi #获取文件路径 file=$@ #获取子路径 filename=`basename $file` #获取父路径 dirpath=`dirname $file` #获取完整路径 cd $dirpath fullpath=`pwd -P` #同步文件到DataNode for (( i=102;i<=103;i++ )) do #使终端变绿色 tput setaf 2 echo =========== node${i}.yinzhengjie.org.cn : $file =========== #使终端变回原来的颜色，即白灰色 tput setaf 7 #远程执行命令 rsync -lr $filename `whoami`@node${i}.yinzhengjie.org.cn:$fullpath #判断命令是否执行成功 if [ $? == 0 ];then echo "命令执行成功" fi done [root@node101 ~]# [root@node101 ~]# [root@node101 ~]# chmod +x /usr/local/bin/xrsync.sh #别忘记添加执行权限哟！ [root@node101 ~]#
[root@node101 ~]# xcall.sh cat /etc/hosts | grep yinzhengjie #我们在没有同步“/etc/hosts”配置文件时，发现只有“node101.yinzhengjie.org.cn”中配置了FQDN ============= node101.yinzhengjie.org.cn : cat /etc/hosts ============ 172.30.1.101 node101.yinzhengjie.org.cn 172.30.1.102 node102.yinzhengjie.org.cn 172.30.1.103 node103.yinzhengjie.org.cn ============= node102.yinzhengjie.org.cn : cat /etc/hosts ============ ============= node103.yinzhengjie.org.cn : cat /etc/hosts ============ [root@node101 ~]# [root@node101 ~]# xrsync.sh /etc/hosts #我们利用咱们自定义的脚本将“/etc/hosts”配置文件下发到"node102.yinzhengjie.org.cn"和“node103.yinzhengjie.org.cn”上去。 =========== node102.yinzhengjie.org.cn : /etc/hosts =========== 命令执行成功 =========== node103.yinzhengjie.org.cn : /etc/hosts =========== 命令执行成功 [root@node101 ~]# [root@node101 ~]# [root@node101 ~]# xcall.sh cat /etc/hosts | grep yinzhengjie #我们验证一下，3台机器上陪孩子是否都相同～如果输出相同说明配置生效啦～ ============= node101.yinzhengjie.org.cn : cat /etc/hosts ============ 172.30.1.101 node101.yinzhengjie.org.cn 172.30.1.102 node102.yinzhengjie.org.cn 172.30.1.103 node103.yinzhengjie.org.cn ============= node102.yinzhengjie.org.cn : cat /etc/hosts ============ 172.30.1.101 node101.yinzhengjie.org.cn 172.30.1.102 node102.yinzhengjie.org.cn 172.30.1.103 node103.yinzhengjie.org.cn ============= node103.yinzhengjie.org.cn : cat /etc/hosts ============ 172.30.1.101 node101.yinzhengjie.org.cn 172.30.1.102 node102.yinzhengjie.org.cn 172.30.1.103 node103.yinzhengjie.org.cn [root@node101 ~]#
4>.关闭防火墙和selinux
[root@node101 java]# xcall.sh systemctl stop firewalld ============= node101.yinzhengjie.org.cn : systemctl stop firewalld ============ 命令执行成功 ============= node102.yinzhengjie.org.cn : systemctl stop firewalld ============ 命令执行成功 ============= node103.yinzhengjie.org.cn : systemctl stop firewalld ============ 命令执行成功 [root@node101 java]#
[root@node101 java]# xcall.sh systemctl disable firewalld ============= node101.yinzhengjie.org.cn : systemctl disable firewalld ============ Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service. Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service. 命令执行成功 ============= node102.yinzhengjie.org.cn : systemctl disable firewalld ============ Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service. Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service. 命令执行成功 ============= node103.yinzhengjie.org.cn : systemctl disable firewalld ============ Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service. Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service. 命令执行成功 [root@node101 java]#
[root@node101 java]# xcall.sh systemctl status firewalld ============= node101.yinzhengjie.org.cn : systemctl status firewalld ============ ● firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled) Active: inactive (dead) Dec 05 02:28:52 node101.yinzhengjie.org.cn systemd[1]: Starting firewalld - dynamic firewall daemon... Dec 05 02:28:52 node101.yinzhengjie.org.cn systemd[1]: Started firewalld - dynamic firewall daemon. Dec 05 03:42:15 node101.yinzhengjie.org.cn systemd[1]: Stopping firewalld - dynamic firewall daemon... Dec 05 03:42:16 node101.yinzhengjie.org.cn systemd[1]: Stopped firewalld - dynamic firewall daemon. ============= node102.yinzhengjie.org.cn : systemctl status firewalld ============ ● firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled) Active: inactive (dead) Dec 05 02:27:18 nod102.yinzhengjie.org.cn systemd[1]: Starting firewalld - dynamic firewall daemon... Dec 05 02:27:18 nod102.yinzhengjie.org.cn systemd[1]: Started firewalld - dynamic firewall daemon. Dec 05 03:42:16 nod102.yinzhengjie.org.cn systemd[1]: Stopping firewalld - dynamic firewall daemon... Dec 05 03:42:17 nod102.yinzhengjie.org.cn systemd[1]: Stopped firewalld - dynamic firewall daemon. ============= node103.yinzhengjie.org.cn : systemctl status firewalld ============ ● firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled) Active: inactive (dead) Dec 05 02:25:47 node103.yinzhengjie.org.cn systemd[1]: Starting firewalld - dynamic firewall daemon... Dec 05 02:25:47 node103.yinzhengjie.org.cn systemd[1]: Started firewalld - dynamic firewall daemon. Dec 05 03:42:17 node103.yinzhengjie.org.cn systemd[1]: Stopping firewalld - dynamic firewall daemon... Dec 05 03:42:18 node103.yinzhengjie.org.cn systemd[1]: Stopped firewalld - dynamic firewall daemon. [root@node101 java]# [root@node101 java]# [root@node101 java]#
[root@node101 ~]# xcall.sh sed -i 's#SELINUX=enforcing#SELINUX=disabled#' /etc/selinux/config ============= node101.yinzhengjie.org.cn : sed -i s#SELINUX=enforcing#SELINUX=disabled# /etc/selinux/config ============ 命令执行成功 ============= node102.yinzhengjie.org.cn : sed -i s#SELINUX=enforcing#SELINUX=disabled# /etc/selinux/config ============ 命令执行成功 ============= node103.yinzhengjie.org.cn : sed -i s#SELINUX=enforcing#SELINUX=disabled# /etc/selinux/config ============ 命令执行成功 [root@node101 ~]# [root@node101 ~]# [root@node101 ~]# xcall.sh cat /etc/selinux/config | grep SELINUX= | grep -v ^# SELINUX=disabled SELINUX=disabled SELINUX=disabled [root@node101 ~]#
[root@node101 ~]# xcall.sh getenforce ============= node101.yinzhengjie.org.cn : getenforce ============ Enforcing 命令执行成功 ============= node102.yinzhengjie.org.cn : getenforce ============ Enforcing 命令执行成功 ============= node103.yinzhengjie.org.cn : getenforce ============ Enforcing 命令执行成功 [root@node101 ~]# [root@node101 ~]# [root@node101 ~]# xcall.sh setenforce 0 ============= node101.yinzhengjie.org.cn : setenforce 0 ============ 命令执行成功 ============= node102.yinzhengjie.org.cn : setenforce 0 ============ 命令执行成功 ============= node103.yinzhengjie.org.cn : setenforce 0 ============ 命令执行成功 [root@node101 ~]# [root@node101 ~]# xcall.sh getenforce ============= node101.yinzhengjie.org.cn : getenforce ============ Permissive 命令执行成功 ============= node102.yinzhengjie.org.cn : getenforce ============ Permissive 命令执行成功 ============= node103.yinzhengjie.org.cn : getenforce ============ Permissive 命令执行成功 [root@node101 ~]#
5>.下载Mangodb数据库的软件
[root@node101 ~]# yum -y install wget Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.shu.edu.cn * extras: mirrors.shu.edu.cn * updates: mirrors.shu.edu.cn Resolving Dependencies --> Running transaction check ---> Package wget.x86_64 0:1.14-18.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================================================================================================= Package Arch Version Repository Size ================================================================================================================================================================= Installing: wget x86_64 1.14-18.el7 base 547 k Transaction Summary ================================================================================================================================================================= Install 1 Package Total download size: 547 k Installed size: 2.0 M Downloading packages: wget-1.14-18.el7.x86_64.rpm | 547 kB 00:00:00 Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : wget-1.14-18.el7.x86_64 1/1 Verifying : wget-1.14-18.el7.x86_64 1/1 Installed: wget.x86_64 0:1.14-18.el7 Complete! [root@node101 ~]#
[root@node101 ~]# wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.4.7.tgz #下载Mongodb --2018-12-22 04:53:32-- https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.4.7.tgz Resolving fastdl.mongodb.org (fastdl.mongodb.org)... 99.84.194.47, 99.84.194.86, 99.84.194.92, ... Connecting to fastdl.mongodb.org (fastdl.mongodb.org)|99.84.194.47|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 86747873 (83M) [application/x-gzip] Saving to: ‘mongodb-linux-x86_64-3.4.7.tgz’ 100%[=======================================================================================================================>] 86,747,873 404KB/s in 3m 33s 2018-12-22 04:57:07 (397 KB/s) - ‘mongodb-linux-x86_64-3.4.7.tgz’ saved [86747873/86747873] [root@node101 ~]#
三.安装部署
1>.解压mongodb软件到指定的目录
[root@node101 ~]# mkdir -pv /yinzhengjie/softwares #创建你经常存放目录的位置 mkdir: created directory ‘/yinzhengjie’ mkdir: created directory ‘/yinzhengjie/softwares’ [root@node101 ~]# [root@node101 ~]# ll total 84716 -rw-r--r--. 1 root root 86747873 Aug 7 2017 mongodb-linux-x86_64-3.4.7.tgz [root@node101 ~]# [root@node101 ~]# tar -zxf mongodb-linux-x86_64-3.4.7.tgz -C /yinzhengjie/softwares/ #加压mangodb到你指定的目录中去 [root@node101 ~]# [root@node101 ~]# ln -s /yinzhengjie/softwares/mongodb-linux-x86_64-3.4.7/ /yinzhengjie/softwares/mongodb #创建软连接 [root@node101 ~]# [root@node101 ~]# ll /yinzhengjie/softwares/ total 0 lrwxrwxrwx. 1 root root 50 Dec 22 05:03 mongodb -> /yinzhengjie/softwares/mongodb-linux-x86_64-3.4.7/ drwxr-xr-x. 3 root root 91 Dec 22 05:03 mongodb-linux-x86_64-3.4.7 [root@node101 ~]#
2>.创建数据目录和日志目录
[root@node101 ~]# cd /yinzhengjie/softwares/mongodb/ [root@node101 mongodb]# ll total 116 drwxr-xr-x. 2 root root 243 Dec 22 05:03 bin -rw-r--r--. 1 root root 34520 Aug 7 2017 GNU-AGPL-3.0 -rw-r--r--. 1 root root 16726 Aug 7 2017 MPL-2 -rw-r--r--. 1 root root 1359 Aug 7 2017 README -rw-r--r--. 1 root root 55625 Aug 7 2017 THIRD-PARTY-NOTICES [root@node101 mongodb]# [root@node101 mongodb]# [root@node101 mongodb]# mkdir db logs conf #创建用于存放数据和日志的目录以及配置文件存放目录 [root@node101 mongodb]# [root@node101 mongodb]# ll total 116 drwxr-xr-x. 2 root root 243 Dec 22 05:03 bin #存放启动脚本的目录 drwxr-xr-x. 2 root root 6 Dec 22 05:19 conf #该目录用于存放配置文件 drwxr-xr-x. 2 root root 6 Dec 22 05:08 db #该目录用于存放数据 -rw-r--r--. 1 root root 34520 Aug 7 2017 GNU-AGPL-3.0 drwxr-xr-x. 2 root root 6 Dec 22 05:08 logs #该目录用于存放日志 -rw-r--r--. 1 root root 16726 Aug 7 2017 MPL-2 -rw-r--r--. 1 root root 1359 Aug 7 2017 README -rw-r--r--. 1 root root 55625 Aug 7 2017 THIRD-PARTY-NOTICES [root@node101 mongodb]# [root@node101 mongodb]# pwd /yinzhengjie/softwares/mongodb [root@node101 mongodb]#
3>.编辑启动mongodb的配置文件
[root@node101 ~]# cd /yinzhengjie/softwares/mongodb/conf/ [root@node101 conf]# [root@node101 conf]# vi mongodb.conf [root@node101 conf]# [root@node101 conf]# cat mongodb.conf dbpath=/yinzhengjie/softwares/mongodb/db #指定数据的存放目录 logpath=/yinzhengjie/softwares/mongodb/logs/mongodb.log #指定日志的存放目录 port=5200 #指定mangodb服务的启动端口 fork=true #指定是否以守护进程启动mangodb，换句话说就是后台启动，我们这里设置为true。 nohttpinterface=true #是否禁止http的接口 [root@node101 conf]#
4>.将mongodb的脚本路径添加到系统环境变量并将“node101.yinzhengjie.org.cn”节点的配置同步到其它节点上去
[root@node101 ~]# vi /etc/profile [root@node101 ~]# [root@node101 ~]# [root@node101 ~]# tail -3 /etc/profile #我们将mongodb的环境变量添加到linux系统的配置文件中 #Add by yinzhengjie export MONGODB_HOME=/yinzhengjie/softwares/mongodb export PATH=$PATH:$MONGODB_HOME/bin [root@node101 ~]# [root@node101 ~]# [root@node101 ~]# source /etc/profile [root@node101 ~]# [root@node101 ~]# xrsync.sh /etc/profile #将数据同步到其它的2个节点上 =========== node102.yinzhengjie.org.cn : /etc/profile =========== 命令执行成功 =========== node103.yinzhengjie.org.cn : /etc/profile =========== 命令执行成功 [root@node101 ~]# [root@node101 ~]# xcall.sh tail -3 /etc/profile #验证是否同步成功 ============= node101.yinzhengjie.org.cn : tail -3 /etc/profile ============ #Add by yinzhengjie export MONGODB_HOME=/yinzhengjie/softwares/mongodb export PATH=$PATH:$MONGODB_HOME/bin 命令执行成功 ============= node102.yinzhengjie.org.cn : tail -3 /etc/profile ============ #Add by yinzhengjie export MONGODB_HOME=/yinzhengjie/softwares/mongodb export PATH=$PATH:$MONGODB_HOME/bin 命令执行成功 ============= node103.yinzhengjie.org.cn : tail -3 /etc/profile ============ #Add by yinzhengjie export MONGODB_HOME=/yinzhengjie/softwares/mongodb export PATH=$PATH:$MONGODB_HOME/bin 命令执行成功 [root@node101 ~]# [root@node101 ~]# [root@node101 ~]# xrsync.sh /yinzhengjie/ #这一步是必须要做的，否则你在做下一步的时候可能启动不了集群 =========== node102.yinzhengjie.org.cn : /yinzhengjie/ =========== 命令执行成功 =========== node103.yinzhengjie.org.cn : /yinzhengjie/ =========== 命令执行成功 [root@node101 ~]#
5>.编写集群启动脚本
[root@node101 ~]# vi /usr/local/bin/mongodb-start.sh [root@node101 ~]# [root@node101 ~]# cat /usr/local/bin/mongodb-start.sh #!/bin/bash #@author :yinzhengjie #blog:http://www.cnblogs.com/yinzhengjie #EMAIL:y1053419035@qq.com for (( i=101;i<=103;i++ ));do ssh node${i}.yinzhengjie.org.cn "source /etc/profile;/yinzhengjie/softwares/mongodb/bin/mongod --replSet repset -f /yinzhengjie/softwares/mongodb/conf/mongodb.conf" done [root@node101 ~]# [root@node101 ~]# [root@node101 ~]# chmod +x /usr/local/bin/mongodb-start.sh [root@node101 ~]#
[root@node101 ~]# mongodb-start.sh #启动mongodb集群 about to fork child process, waiting until server is ready for connections. forked process: 9436 child process started successfully, parent exiting about to fork child process, waiting until server is ready for connections. forked process: 8946 child process started successfully, parent exiting about to fork child process, waiting until server is ready for connections. forked process: 8911 child process started successfully, parent exiting [root@node101 ~]# [root@node101 ~]# xcall.sh ps -ef | grep mongodb | grep -v grep #这里是检查各个节气是否启动了mongodb服务。 root 9436 1 2 10:20 ? 00:00:00 /yinzhengjie/softwares/mongodb/bin/mongod --replSet repset -f /yinzhengjie/softwares/mongodb/conf/mongodb.conf root 8946 1 2 10:20 ? 00:00:00 /yinzhengjie/softwares/mongodb/bin/mongod --replSet repset -f /yinzhengjie/softwares/mongodb/conf/mongodb.conf root 8911 1 2 10:20 ? 00:00:00 /yinzhengjie/softwares/mongodb/bin/mongod --replSet repset -f /yinzhengjie/softwares/mongodb/conf/mongodb.conf [root@node101 ~]#
6>.初始化副本集群
[root@node101 ~]# yum -y install net-tools Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.shu.edu.cn * extras: mirrors.shu.edu.cn * updates: mirrors.shu.edu.cn Resolving Dependencies --> Running transaction check ---> Package net-tools.x86_64 0:2.0-0.24.20131004git.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================================================================================================= Package Arch Version Repository Size ================================================================================================================================================================= Installing: net-tools x86_64 2.0-0.24.20131004git.el7 base 306 k Transaction Summary ================================================================================================================================================================= Install 1 Package Total download size: 306 k Installed size: 918 k Downloading packages: net-tools-2.0-0.24.20131004git.el7.x86_64.rpm | 306 kB 00:00:00 Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : net-tools-2.0-0.24.20131004git.el7.x86_64 1/1 Verifying : net-tools-2.0-0.24.20131004git.el7.x86_64 1/1 Installed: net-tools.x86_64 0:2.0-0.24.20131004git.el7 Complete! [root@node101 ~]#
[root@node101 ~]# ps -ef | grep mongodb | grep -v grep #检查mongodb进程是否存在，发现进程的pid是9436 root 9436 1 1 10:20 ? 00:00:09 /yinzhengjie/softwares/mongodb/bin/mongod --replSet repset -f /yinzhengjie/softwares/mongodb/conf/mongodb.conf [root@node101 ~]# [root@node101 ~]# [root@node101 ~]# netstat -untalp | grep 9436 #我们查看mondb的pid进程是9436，我们可以查看该进程对应的服务端口，发现是咱们设置的5200端口 tcp 0 0 0.0.0.0:5200 0.0.0.0:* LISTEN 9436/mongod [root@node101 ~]# [root@node101 ~]# mongo 127.0.0.1:5200 #登录本地的mongodb数据库 MongoDB shell version v3.4.7 connecting to: 127.0.0.1:5200 MongoDB server version: 3.4.7 Welcome to the MongoDB shell. For interactive help, type "help". For more comprehensive documentation, see http://docs.mongodb.org/ Questions? Try the support group http://groups.google.com/group/mongodb-user Server has startup warnings: 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database. 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted. 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended. 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'. 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never' 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'. 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never' 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] > config = { _id:"repset", members:[{_id:0,host:"node101.yinzhengjie.org.cn:5200"},{_id:1,host:"node102.yinzhengjie.org.cn:5200"},{_id:2,host:"node103.yinzhengjie.org.cn:5200"}]} { "_id" : "repset", "members" : [ { "_id" : 0, "host" : "node101.yinzhengjie.org.cn:5200" }, { "_id" : 1, "host" : "node102.yinzhengjie.org.cn:5200" }, { "_id" : 2, "host" : "node103.yinzhengjie.org.cn:5200" } ] } > > rs.initiate(config); #初始化副本集群 { "ok" : 1 } #出现改行提示说明你成功了，注意要关闭防火墙和selinux配置哟，否则你可能还有其它提示信息，比如拒绝连接之类的！ repset:OTHER> repset:PRIMARY> repset:PRIMARY> repset:PRIMARY> rs.status(); #查看集群节点的状态 { "set" : "repset", "date" : ISODate("2018-12-22T15:48:53.497Z"), "myState" : 1, "term" : NumberLong(1), "heartbeatIntervalMillis" : NumberLong(2000), "optimes" : { "lastCommittedOpTime" : { "ts" : Timestamp(1545493727, 1), "t" : NumberLong(1) }, "appliedOpTime" : { "ts" : Timestamp(1545493727, 1), "t" : NumberLong(1) }, "durableOpTime" : { "ts" : Timestamp(1545493727, 1), "t" : NumberLong(1) } }, "members" : [ { "_id" : 0, "name" : "node101.yinzhengjie.org.cn:5200", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", #这里是节点的状态保存信息！ "uptime" : 1716, "optime" : { "ts" : Timestamp(1545493727, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2018-12-22T15:48:47Z"), "infoMessage" : "could not find member to sync from", "electionTime" : Timestamp(1545493665, 1), "electionDate" : ISODate("2018-12-22T15:47:45Z"), "configVersion" : 1, "self" : true }, { "_id" : 1, "name" : "node102.yinzhengjie.org.cn:5200", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 78, "optime" : { "ts" : Timestamp(1545493727, 1), "t" : NumberLong(1) }, "optimeDurable" : { "ts" : Timestamp(1545493727, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2018-12-22T15:48:47Z"), "optimeDurableDate" : ISODate("2018-12-22T15:48:47Z"), "lastHeartbeat" : ISODate("2018-12-22T15:48:52.040Z"), "lastHeartbeatRecv" : ISODate("2018-12-22T15:48:52.175Z"), "pingMs" : NumberLong(0), "syncingTo" : "node101.yinzhengjie.org.cn:5200", "configVersion" : 1 }, { "_id" : 2, "name" : "node103.yinzhengjie.org.cn:5200", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 78, "optime" : { "ts" : Timestamp(1545493727, 1), "t" : NumberLong(1) }, "optimeDurable" : { "ts" : Timestamp(1545493727, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2018-12-22T15:48:47Z"), "optimeDurableDate" : ISODate("2018-12-22T15:48:47Z"), "lastHeartbeat" : ISODate("2018-12-22T15:48:52.040Z"), "lastHeartbeatRecv" : ISODate("2018-12-22T15:48:52.184Z"), "pingMs" : NumberLong(0), "syncingTo" : "node102.yinzhengjie.org.cn:5200", "configVersion" : 1 } ], "ok" : 1 } repset:PRIMARY> #注意，这里的PRIMARY表示的当前登录的节点是主节点
[root@node102 ~]# mongo 127.0.0.1:5200 MongoDB shell version v3.4.7 connecting to: 127.0.0.1:5200 MongoDB server version: 3.4.7 Welcome to the MongoDB shell. For interactive help, type "help". For more comprehensive documentation, see http://docs.mongodb.org/ Questions? Try the support group http://groups.google.com/group/mongodb-user Server has startup warnings: 2018-12-22T10:20:18.797-0500 I CONTROL [initandlisten] 2018-12-22T10:20:18.798-0500 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database. 2018-12-22T10:20:18.798-0500 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted. 2018-12-22T10:20:18.798-0500 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended. 2018-12-22T10:20:18.798-0500 I CONTROL [initandlisten] 2018-12-22T10:20:18.798-0500 I CONTROL [initandlisten] 2018-12-22T10:20:18.798-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'. 2018-12-22T10:20:18.798-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never' 2018-12-22T10:20:18.798-0500 I CONTROL [initandlisten] 2018-12-22T10:20:18.798-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'. 2018-12-22T10:20:18.798-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never' 2018-12-22T10:20:18.798-0500 I CONTROL [initandlisten] repset:SECONDARY> repset:SECONDARY> #注意这里的“SECONDRY”表示的是副本节点
[root@node103 ~]# mongo 127.0.0.1:5200 MongoDB shell version v3.4.7 connecting to: 127.0.0.1:5200 MongoDB server version: 3.4.7 Welcome to the MongoDB shell. For interactive help, type "help". For more comprehensive documentation, see http://docs.mongodb.org/ Questions? Try the support group http://groups.google.com/group/mongodb-user Server has startup warnings: 2018-12-22T10:20:19.632-0500 I CONTROL [initandlisten] 2018-12-22T10:20:19.632-0500 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database. 2018-12-22T10:20:19.632-0500 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted. 2018-12-22T10:20:19.632-0500 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended. 2018-12-22T10:20:19.632-0500 I CONTROL [initandlisten] 2018-12-22T10:20:19.633-0500 I CONTROL [initandlisten] 2018-12-22T10:20:19.633-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'. 2018-12-22T10:20:19.633-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never' 2018-12-22T10:20:19.633-0500 I CONTROL [initandlisten] 2018-12-22T10:20:19.633-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'. 2018-12-22T10:20:19.633-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never' 2018-12-22T10:20:19.633-0500 I CONTROL [initandlisten] repset:SECONDARY>
四.测试集群功能
1>.登录mongodb的主节点并创建“yinzhengjie”数据库。
repset:PRIMARY> use yinzhengjie #如果数据库不存在，则创建数据库，否则切换到指定数据库。 switched to db yinzhengjie repset:PRIMARY> repset:PRIMARY> db #查看当前所在的数据库 yinzhengjie repset:PRIMARY> repset:PRIMARY> show databases; #查看已经存在的数据库信息 admin 0.000GB local 0.000GB repset:PRIMARY> repset:PRIMARY> show dbs #除了上面的查看方式，我们也可以通过改命令进行查看 admin 0.000GB local 0.000GB repset:PRIMARY> repset:PRIMARY> db.runoob.insert({"job":"DBA"}) #在当前的数据库中创建的runoob表中插入一条数据 WriteResult({ "nInserted" : 1 }) repset:PRIMARY> repset:PRIMARY> db.runoob.find().pretty(); #能查看数据当然就能查看相关的数据信息 { "_id" : ObjectId("5c1e61004f6544b447ca4149"), "job" : "DBA" } repset:PRIMARY> repset:PRIMARY> repset:PRIMARY> show dbs admin 0.000GB local 0.000GB yinzhengjie 0.000GB repset:PRIMARY> repset:PRIMARY> repset:PRIMARY> show databases; admin 0.000GB local 0.000GB yinzhengjie 0.000GB repset:PRIMARY>
2>.从副本节点连接查看数据
mongodb默认是从主节点读取数据，副本节点上不允许读，因此我们在查询的时候会抛异常如下：
repset:SECONDARY> show dbs 2018-12-22T11:13:28.329-0500 E QUERY [thread1] Error: listDatabases failed:{ "ok" : 0, "errmsg" : "not master and slaveOk=false", "code" : 13435, "codeName" : "NotMasterNoSlaveOk" } : _getErrorWithCode@src/mongo/shell/utils.js:25:13 Mongo.prototype.getDBs@src/mongo/shell/mongo.js:62:1 shellHelper.show@src/mongo/shell/utils.js:769:19 shellHelper@src/mongo/shell/utils.js:659:15 @(shellhelp2):1:1 repset:SECONDARY>
解决方案：
默认副本节点上不允许读，那么咱们设置副本节点可读即可，在命令执行“db.getMongo().setSlaveOk();”即可，具体操作如下：
repset:SECONDARY> db.getMongo().setSlaveOk(); repset:SECONDARY> show dbs admin 0.000GB local 0.000GB yinzhengjie 0.000GB repset:SECONDARY> repset:SECONDARY> use yinzhengjie switched to db yinzhengjie repset:SECONDARY> show tables; runoob repset:SECONDARY> db.runoob.find().pretty(); { "_id" : ObjectId("5c1e61004f6544b447ca4149"), "job" : "DBA" } repset:SECONDARY> repset:SECONDARY>
3>.测试集群的恢复功能（杀死mongodb主节点存在的进程，观察其它两个节点是否有人结果主节点的角色）
[root@node101 ~]# mongo 127.0.0.1:5200 #当前节点为主节点 MongoDB shell version v3.4.7 connecting to: 127.0.0.1:5200 MongoDB server version: 3.4.7 Server has startup warnings: 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database. 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted. 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended. 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'. 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never' 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'. 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never' 2018-12-22T10:20:17.974-0500 I CONTROL [initandlisten] repset:PRIMARY> exit bye [root@node101 ~]# [root@node101 ~]# ps -ef | grep mongodb | grep -v grep root 9436 1 1 10:20 ? 00:00:45 /yinzhengjie/softwares/mongodb/bin/mongod --replSet repset -f /yinzhengjie/softwares/mongodb/conf/mongodb.conf [root@node101 ~]# [root@node101 ~]# kill -9 9436 #杀死主节点的进程 [root@node101 ~]# [root@node101 ~]# [root@node101 ~]# mongo 127.0.0.1:5200 #服务没法正常使用了 MongoDB shell version v3.4.7 connecting to: 127.0.0.1:5200 2018-12-22T11:20:15.645-0500 W NETWORK [thread1] Failed to connect to 127.0.0.1:5200, in(checking socket for error after poll), reason: Connection refused 2018-12-22T11:20:15.645-0500 E QUERY [thread1] Error: couldn't connect to server 127.0.0.1:5200, connection attempt failed : connect@src/mongo/shell/mongo.js:237:13 @(connect):1:6 exception: connect failed [root@node101 ~]#
我们发现“node102.yinzhengjie.org.cn”和“node103.yinzhengjie.org.cn”有一个节点立马就接管了主节点的角色
当然也是可以在当前节点查看相应的数据的，具体操作如下：
[root@node103 ~]# mongo 127.0.0.1:5200 MongoDB shell version v3.4.7 connecting to: 127.0.0.1:5200 MongoDB server version: 3.4.7 Welcome to the MongoDB shell. For interactive help, type "help". For more comprehensive documentation, see http://docs.mongodb.org/ Questions? Try the support group http://groups.google.com/group/mongodb-user Server has startup warnings: 2018-12-22T10:20:19.632-0500 I CONTROL [initandlisten] 2018-12-22T10:20:19.632-0500 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database. 2018-12-22T10:20:19.632-0500 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted. 2018-12-22T10:20:19.632-0500 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended. 2018-12-22T10:20:19.632-0500 I CONTROL [initandlisten] 2018-12-22T10:20:19.633-0500 I CONTROL [initandlisten] 2018-12-22T10:20:19.633-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'. 2018-12-22T10:20:19.633-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never' 2018-12-22T10:20:19.633-0500 I CONTROL [initandlisten] 2018-12-22T10:20:19.633-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'. 2018-12-22T10:20:19.633-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never' 2018-12-22T10:20:19.633-0500 I CONTROL [initandlisten] repset:SECONDARY> repset:SECONDARY> repset:SECONDARY> repset:PRIMARY> repset:PRIMARY> repset:PRIMARY> show dbs; admin 0.000GB local 0.000GB yinzhengjie 0.000GB repset:PRIMARY> repset:PRIMARY> show tables; runoob repset:PRIMARY> db.runoob.find().pretty(); { "_id" : ObjectId("5c1e61004f6544b447ca4149"), "job" : "DBA" } repset:PRIMARY> repset:PRIMARY> repset:PRIMARY> exit bye [root@node103 ~]#
好啦~同学们，时间也不早了，本次分析就到这里了，如果你想要学习更多关于Mongodb相关的知识，我给大家推荐一个网站，可以系统的帮你学习Mongodb数据库：http://www.runoob.com/mongodb/mongodb-tutorial.html。
本文来自博客园，作者：尹正杰，转载请注明原文链接：https://www.cnblogs.com/yinzhengjie/p/10146928.html，个人微信: "JasonYin2020"（添加时请备注来源及意图备注，有偿付费）
当你的才华还撑不起你的野心的时候，你就应该静下心来学习。当你的能力还驾驭不了你的目标的时候，你就应该沉下心来历练。问问自己，想要怎样的人生。
