docker [wiki.wurps.de]

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====== Docker ======

===== Docker Registry Proxy =====

https://docs.docker.com/config/daemon/systemd/#httphttps-proxy

===== Bootstrap basic Debian image =====

<code>
mkdir jessie-chroot
sudo debootstrap jessie ./jessie-chroot http://http.debian.net/debian/
</code>

Build docker image from tarball

<code>
cd jessie-chroot
sudo tar cpf - . | docker import - debian
</code>

Build new container

<code>
docker run -it --rm debian /bin/bash
</code>

===== Start Container from Dockerhub Image =====

<code>
docker run --name nifi -p 8080:8080 -d apache/nifi:latest
</code>

With interactive shell:

<code>
docker run -it apache/nifi bash
</code>

===== Jump into Container =====

<code>
docker exec -it nifi bash
</code>

===== Stop Container =====

<code>
docker stop nifi
</code>

===== Remove Containers, Images, Volumes =====

<code>
docker stop $(docker ps -aq) && docker rm $(docker ps -aq) && docker rmi $(docker images -aq) && docker volume rm $(docker volume ls -q)
</code>

===== Aliases =====
//(Docker aliases to set for the shell)//
<code>
alias dps='docker ps -a --format "table {{.Names}}\t{{.Status}}\t{{.Ports}}\t{{.Image}}\t{{.Command}}" | (read -r; printf "%s\n" "$REPLY"; sort -k 1 )'
</code>


===== Docker Logging =====
====== Logging with rsyslog ======
/etc/rsyslog.d/docker.conf
<code>
# Docker config
$AddUnixListenSocket /tmp/syslog.sock

# syslogtag enthält noch PID
# programname nur appname/tag: 598-rddnsmasq
$template myFormat,"%timereported% %programname%%msg:::sp-if-no-1st-sp%%msg:::drop-last-lf%\n"

template(
  name="docker_container_file"
  type="string"
  string="/var/log/docker/%programname%.log"
  option.casesensitive="on"
)

# 23: local7
if $syslogfacility == 23 then {
  if $programname startswith "bw_" then {
    action(name="docker-containers-bitwarden" type="omfile" file="/var/log/docker/bitwarden.log" template="myFormat")
  } else {
    action(name="docker-containers" type="omfile" dynaFile="docker_container_file" template="myFormat")
  }
}
</code>

/etc/docker/daemon.json
<code>
{
  "log-driver": "syslog",
  "log-opts":
    {
      "tag": "{{.Name}}",
      "syslog-facility": "local7",
      "syslog-address": "unixgram:///tmp/syslog.sock"
    }
}
</code>

Restart rsyslog, the docker daemon and then all containers to switch to the new driver. Otherwise the docker daemon shows the following error message for the affected containers: "Configured log driver does not support reads, enabling local file cache for container logs".