kubectl管理kubernetes集群

[root@master ~]# kubectl get nodes  查看集群节点 NAME      STATUS    AGE node1    Ready    25m node2    Ready    19m [root@master ~]# kubectl version  查看版本 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@master ~]# kubectl run nginx --image=docker.io/nginx --replicas=1 --port=9000 deployment "nginx" created [root@master ~]# kubectl get deployment NAME      DESIRED  CURRENT  UP-TO-DATE  AVAILABLE  AGE nginx    1        1        1            0          15s [root@master ~]# kubectl get pods NAME                    READY    STATUS    RESTARTS  AGE nginx-2187705812-8r0h4  1/1      Running  0          1h [root@master ~]# kubectl get pods -o wide NAME                    READY    STATUS    RESTARTS  AGE      IP          NODE nginx-2187705812-8r0h4  1/1      Running  0          1h        10.255.4.2  node1 想要删除一个容器的时候：

[root@master ~]# kubectl delete pod nginx-2187705812-8r0h4 pod "nginx-2187705812-8r0h4" deleted [root@master ~]# kubectl get pod NAME                    READY    STATUS              RESTARTS  AGE nginx-2187705812-6dn2r  0/1      ContainerCreating  0          4s 删除了之后还依然有，这个是因为创建deployment的时候参数--replicas=1起作用了。想要删除的话直接删除deployment就可以了。

[root@master ~]# kubectl delete deployment nginx deployment "nginx" deleted

yaml语法：

[root@master ~]# kubectl create -f MySQL-deployment.yaml deployment "mysql" created [root@master ~]# kubectl get deployment NAME      DESIRED  CURRENT  UP-TO-DATE  AVAILABLE  AGE mysql    1        1        1            1          9s [root@master ~]# kubectl get pods -o wide NAME                    READY    STATUS    RESTARTS  AGE      IP          NODE mysql-2261771434-r8td1  1/1      Running  0          16s      10.255.4.2  node1 在node1上查看mysql docker实例

[root@node1 ~]# docker ps -a CONTAINER ID        IMAGE                                                        COMMAND                  CREATED            STATUS                    PORTS              NAMES e33797549b8e        docker.io/mysql/mysql-server                                "/entrypoint.sh my..."  4 minutes ago      Up 4 minutes (healthy)                        k8s_mysql.31ec27ee_mysql-2261771434-r8td1_default_351da1d4-f082-11e8-bbf2-000c297d60e3_089418b7

kubectl其他参数：

logs      取得pod中容器的log信息

exec    在容器中执行一条命令

cp        从容器拷出或者想容器中拷入文件

attach    attach到一个运行的容器上

logs

[root@master ~]# kubectl get pod NAME                    READY    STATUS    RESTARTS  AGE mysql-2261771434-r8td1  1/1      Running  0          18m [root@master ~]# kubectl logs mysql-2261771434-r8td1 [Entrypoint] MySQL Docker Image 5.7.20-1.1.2 [Entrypoint] Initializing database [Entrypoint] Database initialized Warning: Unable to load '/usr/share/zoneinfo/iso3166.tab' as time zone. Skipping it. Warning: Unable to load '/usr/share/zoneinfo/zone.tab' as time zone. Skipping it. Warning: Unable to load '/usr/share/zoneinfo/zone1970.tab' as time zone. Skipping it. [Entrypoint] ignoring /docker-entrypoint-initdb.d/* [Entrypoint] Server shut down [Entrypoint] MySQL init process done. Ready for start up. [Entrypoint] Starting MySQL 5.7.20-1.1.2

exec： [root@master ~]# kubectl exec mysql-2261771434-r8td1 ls [root@master ~]# kubectl exec -it mysql-2261771434-r8td1 bash bash-4.2# cp： [root@master ~]# kubectl cp mysql-2261771434-r8td1:/tmp/hosts /etc/hosts error: unexpected EOF

[root@master ~]# kubectl cp --help Examples:   # !!!Important Note!!!   # Requires that the 'tar' binary is present in your container  使用kubectl cp 你的容器实例中必须有tar命令，如果没有的话就会失败   # image.  If 'tar' is not present, 'kubectl cp' will fail. [root@master ~]# kubectl exec -it mysql-2261771434-r8td1 bash bash-4.2# yum install tar net-tools -y 

bash-4.2# echo 'this is test' > /tmp/test.txt

再次测试：

拷贝出来

[root@master ~]# kubectl cp mysql-2261771434-r8td1:/tmp/test.txt /opt/test.txt [root@master ~]# more /opt/test.txt this is test

拷贝回去：

[root@master ~]# echo "this is out" >> /opt/test.txt

[root@master ~]# kubectl cp /opt/test.txt mysql-2261771434-r8td1:/tmp/test.txt

[root@master ~]# kubectl exec -it mysql-2261771434-r8td1 bash bash-4.2# cat /tmp/test.txt this is test

this is out

kubectl attach：

用户取得pod中容器的实时信息，可以持续不断实时的取出信息。类似于tail -f