1. Install the following rpm if they are not already installed
yum install -y yum-utils device-mapper-persistent-data lvm2 Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager This system is not registered with an entitlement server. You can use subscription-manager to register. redhatdvdiso | 4.1 kB 00:00:00 Package yum-utils-1.1.31-42.el7.noarch already installed and latest version Package device-mapper-persistent-data-0.7.0-0.1.rc6.el7.x86_64 already installed and latest version Package 7:lvm2-2.02.171-8.el7.x86_64 already installed and latest version Nothing to do2. Install container-selinux, which needs to be downloaded a separate extras package from redhat.
rpm -ivh container-selinux-2.42-1.gitad8f0f7.el7.noarch.rpm warning: container-selinux-2.42-1.gitad8f0f7.el7.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY Preparing... ################################# [100%] Updating / installing... 1:container-selinux-2:2.42-1.gitad8################################# [100%]3. Next requires the Extra Package for Enterprise Linux (EPEL) subscription. If one is not available or there's no spare subscription to be used with the server used for docker, then use OEL7 public repository. Add the following to /etc/yum.repos.d/oel7_EPEL.repo.
[ol7_developer_EPEL] name=Oracle Linux $releasever Developement Packages ($basearch) baseurl=http://yum.oracle.com/repo/OracleLinux/OL7/developer_EPEL/$basearch/ gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle gpgcheck=0 enabled=1Make sure gpgcheck=0, if not following error will be thrown during docker installation.
GPG key retrieval failed: [Errno 14] curl#37 - "Couldn't open file /etc/pki/rpm-gpg/RPM-GPG-KEY-oracle"4. Download the docker CE repository for centOS.
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo5. Disable the bleeding edge features if not needed
yum-config-manager --disable docker-ce-edge5. Install the docker-ce using yum.
# yum install docker-ce Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager This system is not registered with an entitlement server. You can use subscription-manager to register. ol7_developer_EPEL | 1.2 kB 00:00:00 Resolving Dependencies --> Running transaction check ---> Package docker-ce.x86_64 0:18.03.1.ce-1.el7.centos will be installed --> Processing Dependency: pigz for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 --> Running transaction check ---> Package pigz.x86_64 0:2.3.4-1.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ============================================================================================================================================================================================== Package Arch Version Repository Size ============================================================================================================================================================================================== Installing: docker-ce x86_64 18.03.1.ce-1.el7.centos docker-ce-stable 35 M Installing for dependencies: pigz x86_64 2.3.4-1.el7 ol7_developer_EPEL 80 k Transaction Summary ============================================================================================================================================================================================== Install 1 Package (+1 Dependent package) Total size: 35 M Installed size: 151 M Is this ok [y/d/N]: y Downloading packages: Running transaction check Running transaction test Transaction test succeeded Running transaction Warning: RPMDB altered outside of yum. Installing : pigz-2.3.4-1.el7.x86_64 1/2 Installing : docker-ce-18.03.1.ce-1.el7.centos.x86_64 2/2 Verifying : docker-ce-18.03.1.ce-1.el7.centos.x86_64 1/2 Verifying : pigz-2.3.4-1.el7.x86_64 2/2 Installed: docker-ce.x86_64 0:18.03.1.ce-1.el7.centos Dependency Installed: pigz.x86_64 0:2.3.4-1.el7 Complete!
6. Start docker and run the hello-world image to verify the docker installation.
# systemctl start docker
# systemctl enable docker
# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
9bb5a5d4561a: Pull complete
Digest: sha256:f5233545e43561214ca4891fd1157e1c3c563316ed8e237750d59bde73361e77
Status: Downloaded newer image for hello-world:latest
Hello from Docker!
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(amd64)
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.
To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash
Share images, automate workflows, and more with a free Docker ID:
https://hub.docker.com/
For more examples and ideas, visit:
https://docs.docker.com/engine/userguide/7. At this stage docker is installing and running without any issue. If a user other than root needs to run docker, simply make that user part of the docker OS group. Following put oracle user into docker group.# usermod -a -G docker oracle # id oracle uid=1000(oracle) gid=1002(oinstall) groups=1002(oinstall),1001(dba),1003(oper),985(docker)8. By default docker images are created in /var/lib/docker. If this path is in / partition or in a parition that has limited space then it's better to move the docker root directory to different location. To do this stop docker and edit the docker service file by adding the new directory path to ExecStart.
#systemctl stop docker vi /usr/lib/systemd/system/docker.service ExecStart=/usr/bin/dockerd --data-root /opt/docker # systemctl daemon-reload # systemctl start docker # docker info docker info Containers: 0 Running: 0 Paused: 0 Stopped: 0 Images: 17 Server Version: 18.03.1-ce Storage Driver: overlay2 Backing Filesystem: xfs Supports d_type: true Native Overlay Diff: true Logging Driver: json-file Cgroup Driver: cgroupfs Plugins: Volume: local Network: bridge host macvlan null overlay Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog Swarm: inactive Runtimes: runc Default Runtime: runc Init Binary: docker-init containerd version: 773c489c9c1b21a6d78b5c538cd395416ec50f88 runc version: 4fc53a81fb7c994640722ac585fa9ca548971871 init version: 949e6fa Security Options: seccomp Profile: default Kernel Version: 3.10.0-693.el7.x86_64 Operating System: Red Hat Enterprise Linux Server 7.4 (Maipo) OSType: linux Architecture: x86_64 CPUs: 8 Total Memory: 11.56GiB Name: hpc3.domain.net ID: Z3SI:SMHM:P7J7:623J:OGSR:7FNJ:SZGX:HN6X:R6NS:FXUB:BAQ6:XQCB Docker Root Dir: /opt/docker Debug Mode (client): false Debug Mode (server): false Registry: https://index.docker.io/v1/ Labels: Experimental: false Insecure Registries: 127.0.0.0/8 Live Restore Enabled: falseThis concludes installing docker-ce on RHEL 7.
