Redis单机配置多实例，实现主从同步
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本文转自:http://www.cnblogs.com/lgeng/p/6623336.html
一，单机多实例：
Redis官网: https://redis.io/
1,安装：
yum -y install gcc gcc-c++ #安装编译工具 [root@localhost data]# wget http://download.redis.io/releases/redis-3.2.8.tar.gz [root@localhost data]# tar xzf redis-3.2.8.tar.gz [root@localhost data]# cd redis-3.2.8 [root@localhost data]# make [root@localhost data]# mv redis-3.2.8 /usr/local/redis 注意：可直接 yum install redis -y 安装
启动：（默认启动6379端口）
[root@localhost redis]# /usr/local/redis/src/redis-server
2，验证：使用 redis-cli命令验证 （注意路径）
[root@localhost src]# /usr/local/redis/src/redis-cli -p 6379 127.0.0.1:6379> keys * (empty list or set) 127.0.0.1:6379> set k1 v1 OK 127.0.0.1:6379> keys * 1) "k1" 127.0.0.1:6379> get k1 "v1" 127.0.0.1:6379> 127.0.0.1:6379>
3,配置环境变量
输入redis-server和redis-cli命令，每次输入完整的路径
将路径添加到PATH变量中
echo 'PATH=${PATH}:/usr/local/redis/src/' >> /etc/profile source /etc/profile #<== 重新加载配置文件
二，单机多实例
创建不同实例的数据存放目录 分别创建6380，6381，6382 三个实例
每个实例目录中分别创建 conf，db，log目录，并拷贝配置文件到conf中
[root@localhost /]# mkdir -p /data/redis/{6380,6381,6382}/{conf,db,log} [root@localhost /]# cp /usr/local/redis/redis.conf /data/redis/6380/conf/ [root@localhost /]# cp /usr/local/redis/redis.conf /data/redis/6381/conf/ [root@localhost /]# cp /usr/local/redis/redis.conf /data/redis/6382/conf/ [root@localhost /]# [root@localhost /]# cd /data/redis [root@localhost redis]# ls 6380 6381 6382 [root@localhost redis]# tree . ├── 6380 │ ├── conf │ │ └── redis.conf │ ├── db │ └── log ├── 6381 │ ├── conf │ │ └── redis.conf │ ├── db │ └── log └── 6382 ├── conf │ └── redis.conf ├── db └── log 12 directories, 3 files [root@localhost redis]# [root@localhost redis]#
修改配置文件：
将redis.conf修改为对应的实例参数,修改部分如下
[root@localhost redis]# grep "6380\|daemonize" 6380/conf/redis.conf daemonize yes <== daemon进程运行 pidfile /data/redis/6380/redis.pid <== 进程id存放文件 port 6380 <== 端口 logfile /data/redis/6380/log/redis.log <== 日志目录 dir /data/redis/6380/db/ <== db目录 [root@localhost redis]# [root@localhost redis]# grep "6381" 6381/conf/redis.conf daemonize yes pidfile /data/redis/6381/redis.pid port 6381 logfile /data/redis/6381/log/redis.log dir /data/redis/6381/db/ [root@localhost redis]# [root@localhost redis]# grep "6382" 6382/conf/redis.conf daemonize yes pidfile /data/redis/6382/redis.pid port 6382 logfile /data/redis/6382/log/redis.log dir /data/redis/6382/db/ [root@localhost redis]# [root@localhost redis]#
启动实例：
[root@localhost redis]# redis-server /data/redis/6380/conf/redis.conf [root@localhost redis]# redis-server /data/redis/6381/conf/redis.conf [root@localhost redis]# redis-server /data/redis/6382/conf/redis.conf [root@localhost redis]# [root@localhost redis]# netstat -ntlp | grep -E ":6380|:6381|:6382" tcp 0 0 127.0.0.1:6380 0.0.0.0:* LISTEN 14301/redis-server tcp 0 0 127.0.0.1:6381 0.0.0.0:* LISTEN 14305/redis-server tcp 0 0 127.0.0.1:6382 0.0.0.0:* LISTEN 14309/redis-server [root@localhost redis]# [root@localhost redis]#
验证（略） redis-cli -p 6380 ; redi-cli -p 6381 ; redis-cli -p 6382
三，配置主从同步
修改从库配置，6380实例为主库， 从库为 6381，6382
[root@localhost ~]# vim /data/redis/6381/conf/redis.conf [root@localhost ~]# vim /data/redis/6382/conf/redis.conf ################################# REPLICATION ################################# # Master-Slave replication. Use slaveof to make a Redis instance a copy of # another Redis server. A few things to understand ASAP about Redis replication. # # 1) Redis replication is asynchronous, but you can configure a master to # stop accepting writes if it appears to be not connected with at least # a given number of slaves. # 2) Redis slaves are able to perform a partial resynchronization with the # master if the replication link is lost for a relatively small amount of # time. You may want to configure the replication backlog size (see the next # sections of this file) with a sensible value depending on your needs. # 3) Replication is automatic and does not need user intervention. After a # network partition slaves automatically try to reconnect to masters # and resynchronize with them. # # slaveof <masterip> <masterport> slaveof 127.0.0.1 6380 # If the master is password protected (using the "requirepass" configuration # directive below) it is possible to tell the slave to authenticate before # starting the replication synchronization process, otherwise the master will # refuse the slave request. # # masterauth <master-password> # When a slave loses its connection with the master, or when the replication # is still in progress, the slave can act in two different ways: # # 1) if slave-serve-stale-data is set to 'yes' (the default) the slave will # still reply to client requests, possibly with out of date data, or the # data set may just be empty if this is the first synchronization. # # 2) if slave-serve-stale-data is set to 'no' the slave will reply with # an error "SYNC with master in progress" to all the kind of commands
验证：
先在主库上info一下
[root@localhost 6380]# redis-cli -p 6380 "info" . .此处略去n行 . # Replication role:master <== 角色：master connected_slaves:2 <== slave链接数 2 slave0:ip=127.0.0.1,port=6381,state=online,offset=141,lag=1 <== slave 的信息 slave1:ip=127.0.0.1,port=6382,state=online,offset=141,lag=1 master_repl_offset:141 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:2 repl_backlog_histlen:140
看看从库
[root@localhost 6381]# redis-cli -p 6381 "info" ... .此处略去n行 .... # Replication role:slave <==角色 slave master_host:127.0.0.1 <==master主机 master_port:6380 <== master端口 master_link_status:up <== 链接状态 up master_last_io_seconds_ago:5 master_sync_in_progress:0 slave_repl_offset:673 slave_priority:100 slave_read_only:1 connected_slaves:0 master_repl_offset:0 repl_backlog_active:0 repl_backlog_size:1048576 repl_backlog_first_byte_offset:0 repl_backlog_histlen:0
[root@localhost 6382]# redis-cli -p 6382 "info" ... .此处略去n行 .... # Replication role:slave master_host:127.0.0.1 master_port:6380 master_link_status:up master_last_io_seconds_ago:4 master_sync_in_progress:0 slave_repl_offset:911 slave_priority:100 slave_read_only:1 connected_slaves:0 master_repl_offset:0 repl_backlog_active:0 repl_backlog_size:1048576 repl_backlog_first_byte_offset:0 repl_backlog_histlen:0
在主库上写入数据：[root@localhost 6380]# redis-cli -p 6380 127.0.0.1:6380> set k1 v1 OK 127.0.0.1:6380> keys * 1) "k1" 127.0.0.1:6380> get k1 "v1" 127.0.0.1:6380>
从库上查看是否已同步[root@localhost 6381]# redis-cli -p 6381 127.0.0.1:6381> keys * 1) "k1" 127.0.0.1:6381> get k1 "v1" 127.0.0.1:6381> 127.0.0.1:6381> exit [root@localhost 6381]# redis-cli -p 6382 127.0.0.1:6382> keys * 1) "k1" 127.0.0.1:6382> get k1 "v1" 127.0.0.1:6382>
主库删除数据：
[root@localhost 6380]# redis-cli -p 6380 127.0.0.1:6380> keys * 1) "k1" 127.0.0.1:6380> del k1 (integer) 1 127.0.0.1:6380> keys * (empty list or set) 127.0.0.1:6380>
从库查看
[root@localhost 6381]# redis-cli -p 6381 127.0.0.1:6381> keys * (empty list or set) 127.0.0.1:6381> exit [root@localhost 6381]# redis-cli -p 6382 127.0.0.1:6382> keys * (empty list or set) 127.0.0.1:6382> 127.0.0.1:6382> exit [root@localhost 6381]#
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