Notes

Container logs are deleted when the container is removed. Containers can be referenced by Id (Partial) or Name (Full)

Docker Auto Start

Containers

In the Run command include the following command to ensure that the containers restart automatically if the server ever reboots.

restart unless-stopped

Docker Daemon

Centos and RHEL sometimes will not not automatically start the docker daemon once installed, to do this enter the following commands to ensure that the docker daemon will start automatically if the server ever reboots.

systemctl start docker
systemctl enable docker

Remove Postfix

Centos has postfix built in to the base image which will sometimes conflict with the Virtru docker containers. Remove postfix with the following commands before spinning up the gateway images.

systemctl stop postfix
systemctl disable postfix
yum remove postfix

Control Container

Shell

docker <Action> <Container Id>

Actions

stop - Stops a running container
start - Starts a stopped container
restart - Restarts a running container
rm - Removes a stopped container.
logs - Show logs of a container where applicable
ps - Show list of containers.
exec - Execute a command against a container
stats - Show statistics related to the host or containers.

List Containers

Show Running Containers

docker ps

Show All Containers

docker ps - a

Logs

All logs for the Virtru Gateway are written to the stdout and are thus saved to the docker host via standard logging in the default location of /var/lib/docker/containers/<container id>/<container id>-json.log

All logs can be redirected using standard docker utilities. Please reference Docker Log Managment and Configuration

View Logs

docker logs <Container Id>

View Logs Last 50 Entries

docker logs <Container Id> --tail 50

Search logs for keyword

docker logs <Container Id> | grep <keyword>

Follow Logs

docker logs <Container Id> -f

Follow Logs Starting from 30 minutes ago

docker logs <Container Id> -f --since 30m

Follow Logs Starting from Last 50 Entries

docker logs <Container Id> -f --tail 50

Options

--tail # - Last # of entries
-f - Follow the logs - Ctrl + C to exit
--since - Show logs since timestamp (e.g. 2013-01-02T13:23:37) or relative (e.g. 42m for 42 minutes)
--until - Show logs through timestamp (e.g. 2013-01-02T13:23:37) or relative (e.g. 42m for 42 minutes)
--details - Show extra details provided to logs

Enter Container

Entering the container should be done with caution as all commands are immediate and can adversely affect the functionality.

Command Structure

docker exec -it <Container Id> <Command>

Check Mail Queue

docker exec -it <Container Id> mailq

Enter Bash in Container

docker exec -it <Container Id> /bin/bash

Monitor Container Utilization

This will show the utilization of each container on the host.

Statistics

docker stats

Container Statistics

docker stats <Container Id>