3. 容器备份与迁移

[root@VM_0_3_centos ~]# docker ps -a // 查看本地的容器
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
dc92bf4f2dab redis:latest "docker-entrypoint..." 49 minutes ago Exited (0) 40 minutes ago myredis
f9941aca500b nginx:latest "nginx -g 'daemon ..." 15 hours ago Exited (0) 4 seconds ago nginx
a8168338d283 tomcat:7-jre8 "catalina.sh run" 15 hours ago Up About an hour 0.0.0.0:8080->8080/tcp tomcat
750f40204378 centos:latest "/bin/bash" 4 days ago Exited (137) 14 hours ago mycentos
[root@VM_0_3_centos ~]# docker images // 查看本地的镜像
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/centos latest 75835a67d134 8 days ago 200 MB
docker.io/nginx latest be1f31be9a87 2 weeks ago 109 MB
docker.io/redis latest 0a153379a539 2 weeks ago 83.4 MB
docker.io/solr latest 45749c8baa2a 2 weeks ago 834 MB
docker.io/tomcat 7-jre8 82af61923130 3 weeks ago 463 MB
docker.io/zookeeper latest 89f7884dcc4e 3 weeks ago 148 MB
docker.io/mysql 5.6 1f47fade220d 6 weeks ago 256 MB
【 1. 容器保存为镜像 把nginx容器备份为wuleinginx镜像 】
[root@VM_0_3_centos ~]# docker commit nginx wuleinginx
sha256:7856283560cbb2f04afff3a619b1ce52d212dad41b3c3aa0e4471ab7382bb674
[root@VM_0_3_centos ~]# docker images // 可以看到我们新建的镜像成功了
REPOSITORY TAG IMAGE ID CREATED SIZE
wuleinginx latest 7856283560cb 9 seconds ago 109 MB
docker.io/centos latest 75835a67d134 8 days ago 200 MB
docker.io/nginx latest be1f31be9a87 2 weeks ago 109 MB
docker.io/redis latest 0a153379a539 2 weeks ago 83.4 MB
docker.io/solr latest 45749c8baa2a 2 weeks ago 834 MB
docker.io/tomcat 7-jre8 82af61923130 3 weeks ago 463 MB
docker.io/zookeeper latest 89f7884dcc4e 3 weeks ago 148 MB
docker.io/mysql 5.6 1f47fade220d 6 weeks ago 256 MB
【 2. 镜像备份 把镜像以文件形式保存到宿主机 】
[root@VM_0_3_centos ~]# docker save -o /wuleinginx.tar wuleinginx
[root@VM_0_3_centos ~]# cd / && ll
total 110388
drwxr-xr-x 3 root root 4096 Oct 17 19:28 app
lrwxrwxrwx. 1 root root 7 Jun 11 2017 bin -> usr/bin
dr-xr-xr-x. 4 root root 4096 Apr 12 2018 boot
drwxr-xr-x 2 root root 4096 Apr 12 2018 data
drwxr-xr-x 19 root root 2980 Oct 18 09:41 dev
drwxr-xr-x. 91 root root 12288 Oct 18 09:41 etc
drwxr-xr-x. 2 root root 4096 Sep 29 15:19 home
-rwxr-xr-x 1 root root 4 Oct 18 09:41 idus.log
lrwxrwxrwx. 1 root root 7 Jun 11 2017 lib -> usr/lib
lrwxrwxrwx. 1 root root 9 Jun 11 2017 lib64 -> usr/lib64
drwx------. 2 root root 16384 Jun 11 2017 lost+found
drwxr-xr-x. 2 root root 4096 Nov 5 2016 media
drwxr-xr-x. 3 root root 4096 Oct 18 05:31 mnt
-rw-r--r-- 1 root root 982 Oct 17 19:45 nginx.conf
drwxr-xr-x. 3 root root 4096 Jun 11 2017 opt
dr-xr-xr-x 105 root root 0 Oct 18 09:41 proc
dr-xr-x---. 9 root root 4096 Oct 18 05:31 root
drwxr-xr-x 26 root root 900 Oct 18 09:43 run
lrwxrwxrwx. 1 root root 8 Jun 11 2017 sbin -> usr/sbin
drwxr-xr-x. 2 root root 4096 Nov 5 2016 srv
dr-xr-xr-x 13 root root 0 Oct 18 09:41 sys
drwxrwxrwt. 77 root root 4096 Oct 18 09:42 tmp
drwxr-xr-x. 13 root root 4096 Jun 11 2017 usr
drwxr-xr-x. 20 root root 4096 Oct 18 09:41 var
-rwxr-xr-x 1 root root 4 Oct 18 09:41 vga.conf
-rw-r--r-- 1 root root 2861 Oct 5 12:42 wget-log
-rw------- 1 root root 112824832 Oct 18 10:52 wuleinginx.tar
【 3. 镜像恢复 】
// 先把本地相关的容器和镜像删掉
[root@VM_0_3_centos /]# docker rmi wuleinginx
Untagged: wuleinginx:latest
Deleted: sha256:7856283560cbb2f04afff3a619b1ce52d212dad41b3c3aa0e4471ab7382bb674
Deleted: sha256:bae433800e271454887fd71749800b7834be47a7d0b4be5a69f643a7dcba64f1
[root@VM_0_3_centos /]# docker rm nginx
nginx
[root@VM_0_3_centos /]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
dc92bf4f2dab redis:latest "docker-entrypoint..." 58 minutes ago Exited (0) 49 minutes ago myredis
a8168338d283 tomcat:7-jre8 "catalina.sh run" 16 hours ago Up About an hour 0.0.0.0:8080->8080/tcp tomcat
750f40204378 centos:latest "/bin/bash" 4 days ago Exited (137) 14 hours ago mycentos
[root@VM_0_3_centos /]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/centos latest 75835a67d134 8 days ago 200 MB
docker.io/nginx latest be1f31be9a87 2 weeks ago 109 MB
docker.io/redis latest 0a153379a539 2 weeks ago 83.4 MB
docker.io/solr latest 45749c8baa2a 2 weeks ago 834 MB
docker.io/tomcat 7-jre8 82af61923130 3 weeks ago 463 MB
docker.io/zookeeper latest 89f7884dcc4e 3 weeks ago 148 MB
docker.io/mysql 5.6 1f47fade220d 6 weeks ago 256 MB
// 开始备份
root@VM_0_3_centos /]# docker load -i /wuleinginx.tar
a8f3695862a0: Loading layer [==================================================>] 11.26 kB/11.26 kB
Loaded image: wuleinginx:latest
[root@VM_0_3_centos /]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
wuleinginx latest 7856283560cb 14 minutes ago 109 MB
docker.io/centos latest 75835a67d134 8 days ago 200 MB
docker.io/nginx latest be1f31be9a87 2 weeks ago 109 MB
docker.io/redis latest 0a153379a539 2 weeks ago 83.4 MB
docker.io/solr latest 45749c8baa2a 2 weeks ago 834 MB
docker.io/tomcat 7-jre8 82af61923130 3 weeks ago 463 MB
docker.io/zookeeper latest 89f7884dcc4e 3 weeks ago 148 MB
docker.io/mysql 5.6 1f47fade220d 6 weeks ago 256 MB
【 4. 部署容器 】
[root@VM_0_3_centos /]# docker run -id --name=wuleinginx -p 80:80 wuleinginx:latest
14a8c8b3bf374216a3403869c4002c55b3185458a337d16ebd7b29f34c513b17
[root@VM_0_3_centos /]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
14a8c8b3bf37 wuleinginx:latest "nginx -g 'daemon ..." 4 seconds ago Up 3 seconds 0.0.0.0:80->80/tcp wuleinginx
dc92bf4f2dab redis:latest "docker-entrypoint..." About an hour ago Exited (0) 57 minutes ago myredis
a8168338d283 tomcat:7-jre8 "catalina.sh run" 16 hours ago Up About an hour 0.0.0.0:8080->8080/tcp tomcat
750f40204378 centos:latest "/bin/bash" 4 days ago Exited (137) 15 hours ago mycentos
[root@VM_0_3_centos /]#

测试：