K8S镜像删除及环境清理

环境清理:

#删除所有容器
sudo docker rm -f $(sudo docker ps -qa)

#删除/var/etcd目录
sudo rm -rf /var/etcd

#删除/var/lib/kubelet/目录，删除前先卸载
for m in $(sudo tac /proc/mounts | sudo awk '{print $2}'|sudo grep /var/lib/kubelet);do
 sudo umount $m||true
done
sudo rm -rf /var/lib/kubelet/

#删除/var/lib/rancher/目录，删除前先卸载
for m in $(sudo tac /proc/mounts | sudo awk '{print $2}'|sudo grep /var/lib/rancher);do
 sudo umount $m||true
done
sudo rm -rf /var/lib/rancher/

#删除/run/kubernetes/ 目录
sudo rm -rf /run/kubernetes/

#删除所有的数据卷
sudo docker volume rm $(sudo docker volume ls -q)

#再次显示所有的容器和数据卷，确保没有残留
sudo docker ps -a
sudo docker volume ls

镜像删除：

1. 首先查看镜像

[root@docker-vp1 nexus-3.1.0-04]# docker images
REPOSITORY                             TAG                 IMAGE ID                  CREATED               SIZE
jenkins                                2.19.4              ff6f0851ef57             2 weeks ago           714.1 MB
jenkins/jenkins                        2.19.4              ff6f0851ef57             2 weeks ago           714.1 MB
192.168.1.110/centos/centos            7.2                 38ea04e19303            12 months ago          194.6 MB
192.168.1.111/centos/centos            7.2                 38ea04e19303            12 months ago          194.6 MB

2. 删除其中一个镜像，这里的镜像有两个repo引用，并且没有容器使用

[root@docker-vp1 nexus-3.1.0-04]# docker rmi 38ea04e19303
Error response from daemon: conflict: unable to delete 38ea04e19303 (must be forced) - image is referenced in one or more repositories

出现上面问题的原因：
对于被删除的ImageID，这里存在多个REPOSITORY名字引用，解决方法如下：

[root@docker-vp1 nexus-3.1.0-04]# docker rmi 192.168.1.111/centos/centos:7.2
Untagged: 192.168.1.111/centos/centos:7.2
Untagged: 192.168.1.111/centos/centos@sha256:05c5e4ffbd3e4e54a685915394858e1dacc38873f02920b57b66551a1626dbd3

即删除时指定名称，而不是IMAGE ID。

然后再删除IMAGE ID就可以了：

[root@docker-vp1 nexus-3.1.0-04]# docker rmi 38ea04e19303
Untagged: 192.168.1.110/centos/centos:7.2
Untagged: 192.168.1.110/centos/centos@sha256:05c5e4ffbd3e4e54a685915394858e1dacc38873f02920b57b66551a1626dbd3
Deleted: sha256:38ea04e1930337de1455fed8651fcc9a029805f4559af44558ba9702340ce1e2
Deleted: sha256:aa62a869f8107ec47faa7ad18eded96b051c249cd2f4a5d0d1bca8baf2757358
Deleted: sha256:3c74eb540809de9dbddebd4681781bb1b6145c981756472cd67c6e3eb7704801
Deleted: sha256:feba031447e29ed7d0f316065820e466ba91a258f3b2e68f8e21e940bc45b5cd
Deleted: sha256:3d3648a4ed44853a2231971a1bccf855b83809767558e164bfebbea079d40c34
Deleted: sha256:322e89546b1db8134d2a5b057779843aa80877705ce70e1182f20f94bf31a43d
Deleted: sha256:5f70bf18a086007016e948b04aed3b82103a36bea41755b6cddfaf10ace3c6ef

3. 继续查看剩余的镜像

[root@docker-vp1 nexus-3.1.0-04]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
jenkins/jenkins     2.19.4              ff6f0851ef57        2 weeks ago         714.1 MB
jenkins             2.19.4              ff6f0851ef57        2 weeks ago         714.1 MB