Docker Handling

Dockerfile

Create Directory

• mkdir ~/docker/im-bind9

Dockerfile

~/docker/im-bind9# cat Dockerfile

#Grundimage hier ubuntu 16:04
FROM ubuntu:16.04
#maintainer sind wir 
MAINTAINER technik@xinux.de
#Dies wird beim build und nur beim  build ausgeführt
RUN  apt-get update && apt-get install -y bind9 
#Frei zugebender Ports
EXPOSE 53
EXPOSE 53/UDP
#Verzeichnis welches wir zum mount vorbereiten
VOLUME  ["/var/cache/bind/"]
VOLUME  ["/etc/bind/"]
#Abschliessendes Kommando beim container erstellen, muss im vordergrund laufen 
CMD ["/usr/sbin/named","-f", "-u", "bind" ]

Build

• cd ~/docker/im-bind9
• docker build -t im-bind9-01 .

Listing

• docker images

REPOSITORY                    TAG                 IMAGE ID            CREATED             SIZE
im-bind9-01                   latest              2b3cce7dde64        About an hour ago   243 MB

Container

Running

• docker run -d -p 53:53 -p 53:53/udp --name co-bind9-01 im-bind9-01

Inspect the Volumes

• docker inspect -f "Vorlage:Json .Mounts" co-bind9-01 | jq .

[
  {
    "Type": "volume",
    "Name": "b0f0d3e275d537526c86f1a062f3955d6aa20392009df54af51598bee0032d5f",
    "Source": "/var/lib/docker/volumes/b0f0d3e275d537526c86f1a062f3955d6aa20392009df54af51598bee0032d5f/_data",
    "Destination": "/etc/bind",
    "Driver": "local",
    "Mode": "",
    "RW": true,
    "Propagation": ""
  },
  {
    "Type": "volume",
    "Name": "df518bd78593b927bf110a7fd12cb6734d0425366d281e2eb57cfbbf96b5901f",
    "Source": "/var/lib/docker/volumes/df518bd78593b927bf110a7fd12cb6734d0425366d281e2eb57cfbbf96b5901f/_data",
    "Destination": "/var/cache/bind",
    "Driver": "local",
    "Mode": "",
    "RW": true,
    "Propagation": ""
  }
]

Config the service

/etc/bind

• cd /var/lib/docker/volumes/b0f0d3e275d537526c86f1a062f3955d6aa20392009df54af51598bee0032d5f/_data

Create a Zone

cat named.conf.local

zone "vulkan.int" {
       type master;
       file "vulkan.int";
       notify no;
};

Create a Zonefile

/var/cache/bind

• cd /var/lib/docker/volumes/df518bd78593b927bf110a7fd12cb6734d0425366d281e2eb57cfbbf96b5901f/_data
• cat vulkan.int

$TTL 300        ; 5 minutes
@                       IN SOA  ns.vulkan.int. technik.xunix.de. (
                               2011090204 ; serial
                               14400      ; refresh (4 hours)
                               3600       ; retry (1 hour)
                               3600000    ; expire (5 weeks 6 days 16 hours)
                               86400      ; minimum (1 day)
                               )
                       NS      ns.vulkan.int.
ns.vulkan.int.         A       172.17.0.2
www.vulkan.int.        CNAME   waka.xinux.lan.

Check Container

• docker ps -l

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                                             NAMES
5fb1f648756f        im-bind9-01         "/usr/sbin/named -..."   18 minutes ago      Up 18 minutes       0.0.0.0:53->53/tcp, 0.0.0.0:53->53/udp    co-bind9-01

Restart Container

• docker restart co-bind9-01

Check Service

• host -t cname www.vulkan.int 127.0.0.1

Using domain server:
Name: 127.0.0.1
Address: 127.0.0.1#53
Aliases:  

www.vulkan.int is an alias for waka.xinux.lan.

Integration to Systemd

Create a service

• cd /etc/systemd/system
• cat docker-container@.service

[Unit]
Description=Docker Container %I
Requires=docker.service
After=docker.service

[Service]
Restart=always
ExecStart=/usr/bin/docker start -a %i
ExecStop=/usr/bin/docker stop -t 2 %i

[Install]
WantedBy=default.target

Reload systemd

• systemctl daemon-reload

Enable service

• systemctl enable docker-container@co-bind9-01.service