Recently, I had to build an environment which have a kind of real web application running to test LBaaS site affinity solution,. After a few minutes，I made a decision to install a Jenkins container on my testing Centos 7 virtual machines. 

Unfortunately, my Centos virtual machines have no Internet access. So I spent a bit of time to work out how to installl docker and run a container offline on Centos 7. Then I have this blog which maybe can help others who have the same challenge.

The docker version which I am going to install is: 
docker-ce-18.03.1.ce-1.el7.centos

On another Linux Centos 7 (minimum install) which have Internet access, I run the CLI below to identify all required packages for Docker offline installation.
repoquery -R docker-ce-18.03.1.ce-1.el7.centos
From the output, I found out that I need the following packages to complete Docker offline installation:

1:libsepol-2.5-8.1.el7
2:libselinux-2.5-12.el7
3:audit-libs-2.8.1-3.el7_5.1
4:libsemanage-2.5-11.el7
5:libselinux-utils-2.5-12.el7
6:policycoreutils-2.5-22.el7
7:selinux-policy-3.13.1-192.el7
8:libcgroup-0.41-15.el7
9:selinux-policy-targeted-3.13.1-19
10:libsemanage-python-2.5-11.el7
11:audit-libs-python-2.8.1-3.el7_5.1
12:setools-libs-3.3.8-2.el7
13:python-IPy-0.75-6.el7
14:pigz-2.3.3-1.el7.centos
15:checkpolicy-2.5-6.el7
16:policycoreutils-python-2.5-22.el7
17:container-selinux-2:2.68-1.el7
18:docker-ce-18.03.1.ce-1.el7.centos
19:audit-2.8.1-3.el7_5.1

Then I went to download docker rpm package and all dependent packages with yumdownloader:
yumdownloader –resolve  docker-ce-18.03.1.ce-1.el7.centos

I archived the above packages (tar cf docker-ce.offline.tar *.rpm) and uploaded to my offline Centos 7 virtual machines. Then use the rpm CLI to install Docker:

[root@lbaas02 ~]# rpm -ivh –replacefiles –replacepkgs *.rpm

warning: audit-2.8.1-3.el7_5.1.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEYwarning: docker-ce-18.03.1.ce-1.el7.centos.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 621e9f35: NOKEYPreparing…                          ################################# [100%]Updating / installing…   1:libsepol-2.5-8.1.el7             ################################# [  5%]   2:libselinux-2.5-12.el7            ################################# [ 11%]   3:audit-libs-2.8.1-3.el7_5.1       ################################# [ 16%]   4:libsemanage-2.5-11.el7           ################################# [ 21%]   5:libselinux-utils-2.5-12.el7      ################################# [ 26%]   6:policycoreutils-2.5-22.el7       ################################# [ 32%]   7:selinux-policy-3.13.1-192.el7    ################################# [ 37%]   8:libcgroup-0.41-15.el7            ################################# [ 42%]   9:selinux-policy-targeted-3.13.1-19################################# [ 47%]  10:libsemanage-python-2.5-11.el7    ################################# [ 53%]  11:audit-libs-python-2.8.1-3.el7_5.1################################# [ 58%]  12:setools-libs-3.3.8-2.el7         ################################# [ 63%]  13:python-IPy-0.75-6.el7            ################################# [ 68%]  14:pigz-2.3.3-1.el7.centos          ################################# [ 74%]  15:checkpolicy-2.5-6.el7            ################################# [ 79%]  16:policycoreutils-python-2.5-22.el7################################# [ 84%]  17:container-selinux-2:2.68-1.el7   ################################# [ 89%]  18:docker-ce-18.03.1.ce-1.el7.centos################################# [ 95%]  19:audit-2.8.1-3.el7_5.1            ################################# [100%]

After the installation completed,  started and enabled docker service:

[root@lbaas02 ~]# systemctl enable docker

Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.

[root@lbaas02 ~]# systemctl start docker

Now the next question for me is to import the offline Jenkins docker image. Firstly, I pulled the Jenkisn docker image:

docker pull jenkins/jenkins

Then exported the docker image as a file and uploaded to my testing Centos.

docker save -o jenkins.docker jenkins/jenkins

On my testing Centos, I loaded the image to docker process.

[root@lbaas01 ~]# docker load -i jenkins.docker

 f715ed19c28b: Loading layer [==================================================>]  105.5MB/105.5MB 8bb25f9cdc41: Loading layer [==================================================>]  23.99MB/23.99MB 08a01612ffca: Loading layer [==================================================>]  7.994MB/7.994MB 1191b3f5862a: Loading layer [==================================================>]  146.4MB/146.4MB 097524d80f54: Loading layer [==================================================>]  2.332MB/2.332MB 685f72a7cd4f: Loading layer [==================================================>]  3.584kB/3.584kB  9c147c576d67: Loading layer [==================================================>]  1.536kB/1.536kB   e9805f9bdc9e: Loading layer [==================================================>]  356.3MB/356.3MB 8b47d19735d5: Loading layer [==================================================>]  362.5kB/362.5kB e2a15a753d48: Loading layer [==================================================>]  338.9kB/338.9kB 287c6d658570: Loading layer [==================================================>]  3.584kB/3.584kB 5e9d64b80844: Loading layer [==================================================>]  9.728kB/9.728kB   be6e5f898997: Loading layer [==================================================>]  868.9kB/868.9kB  609adfa44126: Loading layer [==================================================>]  4.608kB/4.608kB  a26f92334a9c: Loading layer [==================================================>]  75.92MB/75.92MB de90b90d0715: Loading layer [==================================================>]  4.608kB/4.608kB  13d8fca176c6: Loading layer [==================================================>]  9.216kB/9.216kB   be0781510eef: Loading layer [==================================================>]  4.608kB/4.608kB   d7e644ce9f14: Loading layer [==================================================>]  3.072kB/3.072kB 47dd83bc99e4: Loading layer [==================================================>]  7.168kB/7.168kB  96e3e5ce2959: Loading layer [==================================================>]  12.29kB/12.29kB               Loaded image: jenkins/jenkins:latest

[root@lbaas01 ~]# docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

jenkins/jenkins     latest              51158f0cf7bc        6 days ago          701MB

Now I am able to start my Jenkins docker on this offline Centos 7.

docker run -d -p 8080:8080 -p 50000:50000 -v jenkins_home:/var/jenkins_home jenkins/jenkins

Wait for 2-3 mins. After Jenkins container is fully running, I can login into my Jenkins.:)