How to implement a backup migration of Docker images and container instances

Preface

Everyone uses Docker to download images from the container repository, but this process may depend on the bandwidth of the network, so if you migrate a downloaded image to another environment, or how to implement a backup or restore of a docker container, or migrate, let's talk about it a bit.

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As we all know, Docker's filesystem is aufs, so our image is likely to be a new one on the basis of n images, so it is impossible to get the physical file of the Docker image to migrate, but Docker also gives you the relevant commands to implement the backup operation.

Goal

Migrating google/cadvisor mirrors from the source container environment 192.168.14.1 to 192.168.13.120 inside

1. View the image list of the 192.168.14.1 environment

root@controller:~# Docker images REPOSITORY TAG IMAGE ID CREATED SIZE UBUNTU_DESKTOP_V1 latest 3b97d2c886e0 4 days ago 971.3 MB Ubuntu_de                      Sktop latest 8421b0d33543 7 days ago 946.8 MB Spark-master              Latest 4CF819691DCA 7 days ago 266.3 MB spark-base-2 Latest         df1c40938e7f 9 days ago 266.3 MB spark-base-1 latest c091a4c160b7          9 days ago 266.3 MB spark-base-0 latest 6C41BD72FCCD 9 days ago 266.3 MB Spark-base latest 54c3c018a5e0 9 days ago 261.1 MB u                      Buntu base-spark A2101fbeeaac One days ago 261.1 MB Deploy_mysql    Latest          8F70BD4222B1 2 weeks ago 324.7 MB deploy_ui latest 3d35eaace 8BF 2 weeks ago 765.3 MB Deploy_log latest 7F9DB19786B2 2 weeks Ago 188 mb 192.168.14.1:5008/ubuntu-local2 14.04 b72889fa879c 2 weeks ago 188 MB Lo                            Calhost:5008/ubuntu-local 14.04 b72889fa879c 2 weeks ago 188 MB Ubuntu              14.04 b72889fa879c 2 weeks ago 188 MB Ubuntu Latest b72889fa879c 2 weeks ago 188 MB Registry 2 88ecdbb5a90 8 2 weeks ago 171.1 MB Swarm latest 0f1a3829719c 2 weeks AG
o 18.71 mb MySQL 5.6 f2e8d6c772c0 2 weeks ago 324.6 MB                 Haproxy          Latest 55FC47C91E3B 3 weeks ago 139 MB Nginx 1.9 eb4a127a1188 3 weeks ago 182.7 MB Django Latest f9dac91871          3 weeks ago 451 MB Ubuntu 15.10 4e3b13c8a266 4 weeks ago 136.3 MB Redis latest 4f5f397d4b7c 8 weeks ago 177.6 MB R                   Egistry 2.3.0 5eaced67751b 8 weeks ago 165.7 MB Google/cadvisor Latest a56e3f67a48d 9 weeks ago 46.33 MB Registry Lates T bca04f698ba8 3 months ago 422.9 MB Golang 1.5.1 e62a BE1305A5 5 months ago 709.3 MB Sequenceiq/hadoop-docker latest 5C3CC170C6BC 9 m Onths ago 1.766 GB 

2. Save the image as a tar file via the Docker Save command

root@controller:~# Docker save-o/root/google-cadvisor.tar google/cadvisor root@controller:~# ls admin-openrc.sh Docker Google-cadvisor.tar Pipework root@controller:~# ll Total 46312 drwx------8 root root 4096 May 3 11:20./d Rwxr-xr-x root root 4096 Apr 14 10:53. /-rw-r--r--1 root root 135 Apr 10:35 admin-openrc.sh-rw-------1 root root 37672 Apr 17:39. bash_histor  y-rw-r--r--1 root root 3106 Feb. bashrc drwx------2 root root 4096 Apr 16:10. cache/drwxr-xr-x 2 root root 4096 Apr 22:36 docker/-R--------1 root root one 00:00. erlang.cookie-rw-------1 root Root 47311360 May 3 11:20 google-cadvisor.tar-rw-------1 root root 1727 Apr 11:50. Mysql_history drwxr-xr-x 3 root root 4096 Apr 10:54. novaclient/drwxr-xr-x 4 root root 4096 Apr 10:37 pipework/-rw-r--r--1 root ro OT. Profile drwx------2 root root 4096 Apr 16:10. Ssh/drwxr-xr-x 2 Root Root 4096 Apr 17:01. vim/-rw-------1 root root 11959 Apr 17:01. viminfo
 

Once saved as a tar file, we can copy the file to the 192.168.13.120 container environment in a physical form.

1. View the image list of the target environment

root@controller:~# Docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
ubuntu              Latest              b1e98eb57559        7 days ago          120.1 MB
ubuntu/pipework     latest              a161cd7260da        7 days ago          226 MB
ubuntu/mysql        latest              62b80c65d15b        4 months ago        373.3 MB
Ubuntu/os           Latest              39eea0e53d4e        5 months ago        653.2 MB
ubuntu              14.04               1d073211c498        6 Months ago        187.9 mb
ubuntu              14.04.3             1d073211c498        6 months ago        187.9 MB
Ubuntu              12.04               0ac5b09d8536        6 months ago        136.1 MB
tutum/ubuntu        latest              151c4704c045        months ago       251.5 MB
training/sinatra    latest f0f4ab557f95 at        months ago       447 MB

2. Load the tar file through the Docker load command

root@controller:~# ls AKSUSBD docker-static-ip-master master.zip Sinatra supermapicloudmanager7c Dockerfile Google-cadvisor.tar Pipework-master supermap_icloud_711_30278_255_linux64.tar.g Z supermapiserver root@controller:~# Docker load-i/root/google-cadvisor.tar root@controller:~# Docker images REPOSITOR              Y TAG IMAGE ID CREATED VIRTUAL SIZE Ubuntu Latest          b1e98eb57559 7 days ago 120.1 MB ubuntu/pipework latest a161cd7260da 7 days ago        226 MB Google/cadvisor Latest 77ab3045082e 9 weeks ago 46.33 MB Ubuntu/mysql Latest 62b80c65d15b 4 months ago 373.3 MB Ubuntu/os latest 39eea0e53d 4e 5 months ago 653.2 MB Ubuntu 14.04 1d073211c498 6 months ago 187              .9 MB Ubuntu14.04.3 1d073211c498 6 months ago 187.9 MB Ubuntu 12.04 0ac5b09d8536 6 months ago 136.1 MB Tutum/ubuntu latest 151c4704c045 ten months ago 251.5
 MB training/sinatra latest f0f4ab557f95 months ago 447 MB

We can see that the google/cadvisor image has been loaded in and then started.

root@controller:~# Docker run \ >--volume=/:/rootfs:ro \ >--VOLUME=/VAR/RUN:/VAR/RUN:RW \ >--volume=/sys:/sys:ro \ >--volum                                 E=/var/lib/docker/:/var/lib/docker:ro \ >--publish=8080:8080 \ >--detach=true \ >--name=cadvisor \ > Google/cadvisor:latest 046ad9524cc9                    A92f118869aae7d10f04c6dfb6e215051f07ea47a5a91ea34e22 root@controller:~# Docker ps-a CONTAINER ID IMAGE        COMMAND CREATED STATUS PORTS NAMES 046ad9524cc9 Google/cadvisor:latest "/usr/bin/cadvisor-l" seconds ago up to seconds 0.0.0.0:8080->8080/tcp CA                                   Dvisor 54fd72ea7832 ubuntu:14.04 "/bin/bash" 5 days ago up 2 hours Test1
 

Summarize

In this simple way, we can backup, restore, migrate (backup and restore) of Docker images, instances, which is very convenient for our Docker exchange.