kube-controller docker tag 详解

root@ubuntu:/home/ubuntu# ps -elf | grep control
4 S root     34534 34463  1  80   0 - 53539 futex_ 09:02 ?        00:00:20 kube-controller-manager --allocate-node-cidrs=true --authentication-kubeconfig=/etc/kubernetes/controller-manager.conf --authorization-kubeconfig=/etc/kubernetes/controller-manager.conf --bind-address=127.0.0.1 --client-ca-file=/etc/kubernetes/pki/ca.crt --cluster-cidr=10.244.0.0/16 --cluster-name=kubernetes --cluster-signing-cert-file=/etc/kubernetes/pki/ca.crt --cluster-signing-key-file=/etc/kubernetes/pki/ca.key --controllers=*,bootstrapsigner,tokencleaner --kubeconfig=/etc/kubernetes/controller-manager.conf --leader-elect=true --node-cidr-mask-size=24 --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt --root-ca-file=/etc/kubernetes/pki/ca.crt --service-account-private-key-file=/etc/kubernetes/pki/sa.key --service-cluster-ip-range=10.96.0.0/12 --use-service-account-credentials=true
0 S root     41096 38101  0  80   0 -  1097 pipe_w 09:23 pts/2    00:00:00 grep --color=auto control
root@ubuntu:/home/ubuntu# docker ps -a | grep controller | less
2a76eac2d768        0db9714b83c0           "kube-controller-man…"   20 minutes ago      Up 20 minutes                                  k8s_kube-controller-manager_kube-controller-manager-ubuntu_kube-system_cb87ef4dc335417d42d752668aa1eb27_0
07309a3816f0        k8s.gcr.io/pause:3.2   "/pause"                 20 minutes ago      Up 20 minutes                                  k8s_POD_kube-controller-manager-ubuntu_kube-system_cb87ef4dc335417d42d752668aa1eb27_0
root@ubuntu:/home/ubuntu# docker logs 2a76eac2d768 | more

root@ubuntu:/home/ubuntu# docker image ls | grep controll
mirrorgcrio/kube-controller-manager-arm64                v1.18.1             0db9714b83c0        6 months ago        158MB
k8s.gcr.io/kube-controller-manager                       v1.18.1             0db9714b83c0        6 months ago        158MB
root@ubuntu:/home/ubuntu# 

root@ubuntu:~# docker images | grep controller
mirrorgcrio/kube-controller-manager-arm64                v1.18.1             0db9714b83c0        6 months ago        158MB
k8s.gcr.io/kube-controller-manager                       v1.18.1             0db9714b83c0        6 months ago        158MB

docker tag 详解

 

docker tag 用于给镜像打标签，语法如下：

docker tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG]

① 比如我现在有一个 centos 镜像：

[root@localhost ~]$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
centos              latest              1e1148e4cc2c        2 weeks ago         202MB

② 我对 centos 进行开发，开发了第一个版本，我就可以对这个版本打标签，打完标签后会生成新的镜像：

[root@localhost ~]$ docker tag centos centos:v1

[root@localhost ~]$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
centos              latest              1e1148e4cc2c        2 weeks ago         202MB
centos              v1                  1e1148e4cc2c        2 weeks ago         202MB

③ 我继续对 centos 进行开发，开发了第二个版本，继续打标签：

[root@localhost ~]$ docker tag centos centos:v2

[root@localhost ~]$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
centos              latest              1e1148e4cc2c        2 weeks ago         202MB
centos              v1                  1e1148e4cc2c        2 weeks ago         202MB
centos              v2                  1e1148e4cc2c        2 weeks ago         202MB

④ 以此类推，每开发一个版本打一个标签，如果以后我想回滚版本，就可以使用指定标签的镜像来创建容器：

[root@localhost ~]$ docker run -itd centos:v1