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I am using this commands to install Docker CE on RHEL7 and I am failing with the following: This started tonight after working flawlessly for some time: sudo yum install -y yum-utils sudo yum-config. Docker is a containerization technology that allows you to quickly build, test and deploy applications as portable, self-sufficient containers that can run virtually anywhere. In this tutorial, we’ll go through how to install Docker CE on CentOS 7 and explore the basic Docker concepts and commands.

Docker

After successfully installing Docker, the docker daemon runs with its defaultconfiguration.

Docker

In a production environment, system administrators typically configure thedocker daemon to start and stop according to an organization’s requirements. In mostcases, the system administrator configures a process manager such as SysVinit, Upstart,or systemd to manage the docker daemon’s start and stop.

The Docker daemon can be run directly using the dockerd command. By default it listens onthe Unix socket unix:///var/run/docker.sock

If you’re running the Docker daemon directly by running dockerd insteadof using a process manager, you can append the configuration options to the docker runcommand directly. Other options can be passed to the Docker daemon to configure it.

FlagDescription
-D, --debug=falseEnable or disable debug mode. By default, this is false.
-H,--host=[]Daemon socket(s) to connect to.
--tls=falseEnable or disable TLS. By default, this is false.

Here is an example of running the Docker daemon with configuration options:

These options :

  • Enable -D (debug) mode
  • Set tls to true with the server certificate and key specified using --tlscert and --tlskey respectively
  • Listen for connections on tcp://192.168.59.3:2376

The command line reference has the complete list of daemon flagswith explanations.

As noted above, setting the log level of the daemon to “debug” or enabling debug modewith -D allows the administrator or operator to gain much more knowledge about theruntime activity of the daemon. If faced with a non-responsive daemon, the administratorcan force a full stack trace of all threads to be added to the daemon log by sending theSIGUSR1 signal to the Docker daemon. A common way to send this signal is using the killcommand on Linux systems. For example, kill -USR1 <daemon-pid> sends the SIGUSR1signal to the daemon process, causing the stack dump to be added to the daemon log.

Note: The log level setting of the daemon must be at least “info” level and above forthe stack trace to be saved to the logfile. By default the daemon’s log level is set to“info”.

The daemon will continue operating after handling the SIGUSR1 signal and dumping the stacktraces to the log. The stack traces can be used to determine the state of all goroutines andthreads within the daemon.

As of 14.04, Ubuntu uses Upstart as a process manager. By default, Upstart jobsare located in /etc/init and the docker Upstart job can be found at /etc/init/docker.conf.

After successfully installing Docker for Ubuntu,you can check the running status using Upstart in this way:

Running Docker

You can start/stop/restart the docker daemon using

Configuring Docker

The instructions below depict configuring Docker on a system that uses upstartas the process manager. As of Ubuntu 15.04, Ubuntu uses systemd as its processmanager. For Ubuntu 15.04 and higher, refer to control and configure Docker with systemd.

You configure the docker daemon in the /etc/default/docker file on yoursystem. You do this by specifying values in a DOCKER_OPTS variable.

  1. Log into your host as a user with sudo or root privileges.

  2. If you don’t have one, create the /etc/default/docker file on your host. Depending on howyou installed Docker, you may already have this file.

  3. Open the file with your favorite editor.

  4. Add a DOCKER_OPTS variable with the following options. These options are appended to thedocker daemon’s run command.

These options :

  • Enable -D (debug) mode
  • Set tls to true with the server certificate and key specified using --tlscert and --tlskey respectively
  • Listen for connections on tcp://192.168.59.3:2376

The command line reference has the complete list of daemon flagswith explanations.

  1. Save and close the file.

  2. Restart the docker daemon.

  3. Verify that the docker daemon is running as specified with the ps command.

By default logs for Upstart jobs are located in /var/log/upstart and the logs for docker daemoncan be located at /var/log/upstart/docker.log

CentOS / Red Hat Enterprise Linux / Fedora

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As of 7.x, CentOS and RHEL use systemd as the process manager. As of 21, Fedora usessystemd as its process manager.

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After successfully installing Docker for CentOS/Red Hat Enterprise Linux/Fedora, you can check the running status in this way:

Running Docker

You can start/stop/restart the docker daemon using

If you want Docker to start at boot, you should also:

Configuring Docker

For CentOS 7.x and RHEL 7.x you can control and configure Docker with systemd.

Previously, for CentOS 6.x and RHEL 6.x you would configure the docker daemon inthe /etc/sysconfig/docker file on your system. You would do this by specifyingvalues in a other_args variable. For a short time in CentOS 7.x and RHEL 7.x youwould specify values in a OPTIONS variable. This is no longer recommended in favorof using systemd directly.

For this section, we will use CentOS 7.x as an example to configure the docker daemon.

  1. Log into your host as a user with sudo or root privileges.

  2. Create the /etc/systemd/system/docker.service.d directory.

  3. Create a /etc/systemd/system/docker.service.d/docker.conf file.

  4. Open the file with your favorite editor.

  5. Override the ExecStart configuration from your docker.service file to customizethe docker daemon. To modify the ExecStart configuration you have to specifyan empty configuration followed by a new one as follows:

These options :

  • Enable -D (debug) mode
  • Set tls to true with the server certificate and key specified using --tlscert and --tlskey respectively
  • Listen for connections on tcp://192.168.59.3:2376

The command line reference has the complete list of daemon flagswith explanations.

  1. Save and close the file.

  2. Flush changes.

  3. Restart the docker daemon.

  4. Verify that the docker daemon is running as specified with the ps command.

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systemd has its own logging system called the journal. The logs for the docker daemon canbe viewed using journalctl -u docker

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Note: Using and configuring journal is an advanced topic and is beyond the scope of this article.

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