kubernetes云平台管理实战: 集群部署(一)
一、环境规划
1、架构拓扑图
2、主机规划
3、软件版本
最新版本详见:https://www.cnblogs.com/luoahong/p/12917582.html
[root@k8s-master ~]# cat /etc/redhat-release CentOS Linux release 7.4.1708 (Core) [root@k8s-master ~]# uname -r 3.10.0-693.el7.x86_64 [root@k8s-master ~]# docker version Client: Version: 1.12.6 API version: 1.24 Package version: docker-1.12.6-68.gitec8512b.el7.centos.x86_64 Go version: go1.8.3 Git commit: ec8512b/1.12.6 Built: Mon Dec 11 16:08:42 2017 OS/Arch: linux/amd64 Server: Version: 1.12.6 API version: 1.24 Package version: docker-1.12.6-68.gitec8512b.el7.centos.x86_64 Go version: go1.8.3 Git commit: ec8512b/1.12.6 Built: Mon Dec 11 16:08:42 2017 OS/Arch: linux/amd64 [root@k8s-master ~]# kubectl version Client Version: version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.2", GitCommit:"269f928217957e7126dc87e6adfa82242bfe5b1e", GitTreeState:"clean", BuildDate:"2017-07-03T15:31:10Z", GoVersion:"go1.7.4", Compiler:"gc", Platform:"linux/amd64"} Server Version: version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.2", GitCommit:"269f928217957e7126dc87e6adfa82242bfe5b1e", GitTreeState:"clean", BuildDate:"2017-07-03T15:31:10Z", GoVersion:"go1.7.4", Compiler:"gc", Platform:"linux/amd64"} [root@k8s-master ~]# kubectl cluster-info Kubernetes master is running at http://localhost:8080 To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'. [root@k8s-master ~]# kubectl get node NAME STATUS AGE k8s-node1 Ready 1d k8s-node2 Ready 1d
4、修改主机和host解析
1、修改主机
hostnamectl set-hostname k8s-master hostnamectl set-hostname k8s-node1 hostnamectl set-hostname k8s-node2
2、hosts解析
[root@k8s-master ~]# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 k8s-master 10.0.128.0 k8s-node1 10.0.128.1 k8s-node2 10.0.128.2 scp -rp /etc/hosts 10.0.128.1:/etc/hosts scp -rp /etc/hosts 10.0.128.2:/etc/hosts
二、所有节点安装docker-1.12.6-68
1、下载rpm包到本地
http://vault.centos.org/7.4.1708/extras/x86_64/Packages/
2、安装
yum localinstall docker-common-1.12.6-68.gitec8512b.el7.centos.x86_64.rpm -y yum localinstall docker-client-1.12.6-68.gitec8512b.el7.centos.x86_64.rpm -y yum localinstall docker-1.12.6-68.gitec8512b.el7.centos.x86_64.rpm -y
3、启动
[root@k8s-master ~]# systemctl enable docker.service [root@k8s-node1 ~]# systemctl enable docker.service [root@k8s-node2 ~]# systemctl enable docker.service
4、遇到的坑
1、docker-common,docker-client,docker-1.12.6-68先后顺序一定不能乱,负责会安装失败
2、我安装的时候就把docker-client和docker-common的顺序搞反,耽误了半天时间
三、master节点安装etcd
k8s数据库kv类型存储,原生支持做集群
1、安装
yum install etcd.x86_64 -y
2、配置
vim /etc/etcd/etcd.conf 修改一下两行: ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379" ETCD_ADVERTISE_CLIENT_URLS="http://10.0.128.0:2379"
3、启动
systemctl start etcd.service systemctl enable etcd.service
4、健康检查
[root@k8s-master ~]# netstat -lntup Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 127.0.0.1:2380 0.0.0.0:* LISTEN 1396/etcd tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1162/sshd tcp6 0 0 :::2379 :::* LISTEN 1396/etcd tcp6 0 0 :::22 :::* LISTEN 1162/sshd udp 0 0 0.0.0.0:30430 0.0.0.0:* 1106/dhclient udp 0 0 0.0.0.0:68 0.0.0.0:* 1106/dhclient udp 0 0 127.0.0.1:323 0.0.0.0:* 869/chronyd udp6 0 0 :::42997 :::* 1106/dhclient udp6 0 0 ::1:323 :::* 869/chronyd [root@k8s-master ~]# etcdctl set tesstdir/testkey0 0 0 [root@k8s-master ~]# etcdctl get tesstdir/testkey0 0 [root@k8s-master ~]# etcdctl -C http://10.0.128.0:2379 cluster-health member 8e9e05c52164694d is healthy: got healthy result from http://10.0.128.0:2379 cluster is healthy [root@k8s-master ~]# systemctl stop etcd.service [root@k8s-master ~]# etcdctl -C http://10.0.128.0:2379 cluster-health cluster may be unhealthy: failed to list members Error: client: etcd cluster is unavailable or misconfigured; error #0: dial tcp 10.0.128.0:2379: getsockopt: connection refused error #0: dial tcp 10.0.128.0:2379: getsockopt: connection refused [root@k8s-master ~]# systemctl start etcd.service [root@k8s-master ~]# etcdctl -C http://10.0.128.0:2379 cluster-health member 8e9e05c52164694d is healthy: got healthy result from http://10.0.128.0:2379 cluster is healthy
四、master节点安装kubernetes,k8s
1、安装
[root@k8s-master ~]# yum install kubernetes-master.x86_64 -y
2、配置
[root@k8s-master ~]#vim /etc/kubernetes/apiserver 修改如下: KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0" KUBE_API_PORT="--port=8080" KUBELET_PORT="--kubelet-port=10250" KUBE_ETCD_SERVERS="--etcd-servers=http://10.0.128.0:2379" KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota" [root@k8s-master ~]#vim /etc/kubernetes/config 修改如下: KUBE_MASTER="--master=http://10.0.128.0:8080"
3、启动
systemctl start kube-apiserver.service systemctl start kube-controller-manager.service systemctl start kube-scheduler.service systemctl enable kube-apiserver.service systemctl enable kube-controller-manager.service systemctl enable kube-scheduler.service
4、组件作用
api-server: 接受并响应用户的请求
controller: 控制器管理,保证容器始终存活
scheduler: 调度器,选择启动容器的node节点
五、node节点安装kubernetes
1、安装
[root@k8s-node1 ~]#yum install kubernetes-node.x86_64 -y
2、配置
[root@k8s-node1 ~]# vim /etc/kubernetes/config 修改如下内容 : KUBE_MASTER="--master=http://10.0.128.0:8080" [root@k8s-node1 ~]# vim /etc/kubernetes/kubelet 修改如下内容: KUBELET_ADDRESS="--address=0.0.0.0" KUBELET_PORT="--port=10250" KUBELET_HOSTNAME="--hostname-override=k8s-node1" KUBELET_API_SERVER="--api-servers=http://10.0.128.0:8080"
3、启动
[root@k8s-node1 ~]# systemctl enable kubelet.service Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service. [root@k8s-node1 ~]# systemctl start kubelet.service [root@k8s-node1 ~]# systemctl enable kube-proxy.service [root@k8s-node1 ~]# systemctl start kube-proxy.service
4、组件作用
kubelet 调用docker,管理容器生命周期
nova-compute 调用libvirt,管理虚拟机的生命周期
kube-poxy 提供容器网络访问
六、所有节点配置flannel网络
1、master节点
1、安装
[root@k8s-master ~]# yum install flannel -y
2、配置
[root@k8s-master ~]# sed -i 's#http://127.0.0.1:2379#http://10.0.128.0:2379#g' /etc/sysconfig/flanneld [root@k8s-master ~]# etcdctl mk /atomic.io/network/config '{ "Network":"172.16.0.0/16" }' { "Network":"172.16.0.0/16" }
3、启动
[root@k8s-master ~]# systemctl enable flanneld.service Created symlink from /etc/systemd/system/multi-user.target.wants/flanneld.service to /usr/lib/systemd/system/flanneld.service. Created symlink from /etc/systemd/system/docker.service.wants/flanneld.service to /usr/lib/systemd/system/flanneld.service. [root@k8s-master ~]# systemctl start flanneld.service
4、检查是否安装成功
[root@k8s-master ~]# systemctl restart docker [root@k8s-master ~]# systemctl restart kube-apiserver.service [root@k8s-master ~]# systemctl restart kube-controller-manager.service [root@k8s-master ~]# systemctl restart kube-scheduler.service [root@k8s-master ~]# ifconfig flannel0 flannel0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1472 inet 172.16.67.0 netmask 255.255.0.0 destination 172.16.67.0 inet6 fe80::b9bb:f96a:188d:426e prefixlen 64 scopeid 0x20<link> unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 500 (UNSPEC) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 3 bytes 144 (144.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
2、node节点
1、安装
[root@k8s-node1 ~]# yum install flannel -y [root@k8s-node2 ~]# yum install flannel -y
2、配置
[root@k8s-node1 ~]#sed -i 's#http://127.0.0.1:2379#http://10.0.128.0:2379#g' /etc/sysconfig/flannel [root@k8s-node2 ~]#sed -i 's#http://127.0.0.1:2379#http://10.0.128.0:2379#g' /etc/sysconfig/flannel
3、启动
[root@k8s-node1 ~]# systemctl enable flanneld.service Created symlink from /etc/systemd/system/multi-user.target.wants/flanneld.service to /usr/lib/systemd/system/flanneld.service. Created symlink from /etc/systemd/system/docker.service.wants/flanneld.service to /usr/lib/systemd/system/flanneld.service. [root@k8s-node1 ~]# systemctl start flanneld.service [root@k8s-node2 ~]# systemctl enable flanneld.service Created symlink from /etc/systemd/system/multi-user.target.wants/flanneld.service to /usr/lib/systemd/system/flanneld.service. Created symlink from /etc/systemd/system/docker.service.wants/flanneld.service to /usr/lib/systemd/system/flanneld.service. [root@k8s-node2 ~]# systemctl start flanneld.service
4、检查是否安装成功
[root@k8s-node1 ~]# ifconfig flannel0 flannel0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1472 inet 172.16.10.0 netmask 255.255.0.0 destination 172.16.10.0 inet6 fe80::6fc:c859:c331:833d prefixlen 64 scopeid 0x20<link> unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 500 (UNSPEC) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 3 bytes 144 (144.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@k8s-node2 ~]# ifconfig flannel0 flannel0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1472 inet 172.16.48.0 netmask 255.255.0.0 destination 172.16.48.0 inet6 fe80::2f4c:6385:45ca:34b8 prefixlen 64 scopeid 0x20<link> unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 500 (UNSPEC) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 3 bytes 144 (144.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
3、容器网络互通测试
1、所有节点启动容器并获取容器ip地址
[root@k8s-master ~]# kubectl get nodes NAME STATUS AGE k8s-node1 Ready 10h k8s-node2 NotReady 9h [root@k8s-master ~]# docker run -it busybox /bin/sh Unable to find image 'busybox:latest' locally Trying to pull repository docker.io/library/busybox ... latest: Pulling from docker.io/library/busybox 57c14dd66db0: Pull complete Digest: sha256:7964ad52e396a6e045c39b5a44438424ac52e12e4d5a25d94895f2058cb863a0 / # ifconfig|grep eth0 eth0 Link encap:Ethernet HWaddr 02:42:AC:10:30:02 inet addr:172.16.48.2 Bcast:0.0.0.0 Mask:255.255.255.0 [root@k8s-node1 ~]# docker run -it busybox /bin/sh Unable to find image 'busybox:latest' locally Trying to pull repository docker.io/library/busybox ... latest: Pulling from docker.io/library/busybox 57c14dd66db0: Pull complete Digest: sha256:7964ad52e396a6e045c39b5a44438424ac52e12e4d5a25d94895f2058cb863a0 / # ifconfig|grep eth0 eth0 Link encap:Ethernet HWaddr 02:42:AC:10:0A:02 inet addr:172.16.10.2 Bcast:0.0.0.0 Mask:255.255.255.0 [root@k8s-node2 ~]# docker run -it busybox /bin/sh Unable to find image 'busybox:latest' locally Trying to pull repository docker.io/library/busybox ... latest: Pulling from docker.io/library/busybox 57c14dd66db0: Pull complete Digest: sha256:7964ad52e396a6e045c39b5a44438424ac52e12e4d5a25d94895f2058cb863a0 / # ifconfig|grep eth0 eth0 Link encap:Ethernet HWaddr 02:42:AC:10:30:02 inet addr:172.16.48.2 Bcast:0.0.0.0 Mask:255.255.255.0
2、网络互通性测试
[root@k8s-node2 ~]# docker run -it busybox /bin/sh Unable to find image 'busybox:latest' locally Trying to pull repository docker.io/library/busybox ... latest: Pulling from docker.io/library/busybox 57c14dd66db0: Pull complete Digest: sha256:7964ad52e396a6e045c39b5a44438424ac52e12e4d5a25d94895f2058cb863a0 / # ifconfig|grep eth0 eth0 Link encap:Ethernet HWaddr 02:42:AC:10:30:02 inet addr:172.16.48.2 Bcast:0.0.0.0 Mask:255.255.255.0 / # ping 172.16.10.2 PING 172.16.10.2 (172.16.10.2): 56 data bytes 64 bytes from 172.16.10.2: seq=0 ttl=60 time=5.212 ms 64 bytes from 172.16.10.2: seq=1 ttl=60 time=1.076 ms ^C --- 172.16.10.2 ping statistics --- 4 packets transmitted, 4 packets received, 0% packet loss round-trip min/avg/max = 1.076/2.118/5.212 ms / # ping 172.16.48.2 PING 172.16.48.2 (172.16.48.2): 56 data bytes 64 bytes from 172.16.48.2: seq=0 ttl=60 time=5.717 ms 64 bytes from 172.16.48.2: seq=1 ttl=60 time=1.108 ms ^C --- 172.16.48.2 ping statistics --- 7 packets transmitted, 7 packets received, 0% packet loss round-trip min/avg/max = 1.108/1.904/5.717 ms
4、遇到的坑:
如果用docker-1.31可能会有网络不通的情况,解决办法如下
iptables -P FORWARD ACCEPT
七、配置master为镜像仓库
1、master节点
1、配置
vim /etc/sysconfig/docker 修改内容如下: OPTIONS='--selinux-enabled --log-driver=journald --signature-verification=false --registry-mirror=https://registry.docker-cn.com --insecure-registry=10.0.128.0:5000' systemctl restart docker
2、启动私有仓库
[root@k8s-master ~]# docker run -d -p 5000:5000 --restart=always --name registry -v /opt/myregistry:/var/lib/registry registry Unable to find image 'registry:latest' locally Trying to pull repository docker.io/library/registry ... latest: Pulling from docker.io/library/registry cd784148e348: Pull complete 0ecb9b11388e: Pull complete 918b3ddb9613: Pull complete 5aa847785533: Pull complete adee6f546269: Pull complete Digest: sha256:1cd9409a311350c3072fe510b52046f104416376c126a479cef9a4dfe692cf57 ba8d9b958c7c0867d5443ee23825f842a580331c87f6555678709dfc8899ff17 [root@k8s-master ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES ba8d9b958c7c registry "/entrypoint.sh /etc/" 11 seconds ago Up 9 seconds 0.0.0.0:5000->5000/tcp registry 15340ee09614 busybox "/bin/sh" 3 hours ago Exited (1) 19 minutes ago sleepy_mccarthy
3、推送镜像测试
[root@k8s-master ~]# docker tag docker.io/busybox:latest 10.0.128.0:5000/busybox:latest [root@k8s-master ~]# docker push 10.0.128.0:5000/busybox:latest The push refers to a repository [10.0.128.0:5000/busybox] 683f499823be: Pushed latest: digest: sha256:bbb143159af9eabdf45511fd5aab4fd2475d4c0e7fd4a5e154b98e838488e510 size: 527
2、node节点
1、配置
vim /etc/sysconfig/docker 修改内容如下: OPTIONS='--selinux-enabled --log-driver=journald --signature-verification=false --registry-mirror=https://registry.docker-cn.com --insecure-registry=10.0.128.0:5000' systemctl restart docker
2、测试
[root@k8s-node1 ~]# docker pull 10.0.128.0:5000/busybox:latest Trying to pull repository 10.0.128.0:5000/busybox ... latest: Pulling from 10.0.128.0:5000/busybox Digest: sha256:bbb143159af9eabdf45511fd5aab4fd2475d4c0e7fd4a5e154b98e838488e510
作者:罗阿红
出处:http://www.cnblogs.com/luoahong/
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