Note: You need to carefully check the service status. Perform chkconfig docker on to make the service start across reboots. Once device-mapper is installed, start the Docker service as suggested in Step 3. The solution is to upgrade the device-mapper RPM using yum y install device-mapper-event-libs.

usr/bin/docker: relocation error: /usr/bin/docker: symbol dm_task_get_info_with_deferred_remove, version Base not defined in file libdevmapper.so.1.02 with link time reference. The reason for the failure is that Docker has a dependency on device-mapper and the Docker version used in this specific version of CentOS7 expects the devicemapper version to be >= 1.02.90.

Note: In this specific version of CentOS7, the Docker engine kept showing an error code Failed to start Docker Application Container Engine. Start the Docker service using systemctl start rvice. Install Docker using yum y install docker.ģ. Add the following lines to /etc/yum.conf: proxy= proxy_username=Ģ. The very first step is setting up Yum with the proxy details. So lets get on with installing and setting up Docker on a CentOS7 machine (CentOS Linux release (Core) and kernel version is 3.10.0-123.20.1.el7.x86_64) when it runs behind a proxy. When you run Docker behind a proxy, you need to provide the proxy details to download the images. Setting up Docker in CentOS7, which runs behind a proxy Figure 1: Docker engine service status Figure 2: Docker engine service status with dns resolution set

Centos 7 docker install