Tag: Docker

start docker with customer system name and hostname

Posted on by admin

docker run --name david -h david-01 -it david/c6nodepm2yo /bin/bash

nJoy 😉

shows :

docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f4da454e156e david/c6nodepm2yo "/bin/bash" 12 seconds ago Exited (0) 3 seconds ago david
d5ec5101ba52 david/centos6:node "/bin/bash" 27 hours ago Up 26 hours 0.0.0.0:8000->80/tcp jovial_borg

and when connected :

[root@david-01 /]#

starting a machine in Docker with ports

Posted on by admin 
docker run -p 800:80 -p 2222:22 -p  4443:443  -it 68715929d32a  /bin/bash

If ports do not work check :

sysctl net.ipv4.ip_forward

if  you get:

net.ipv4.ip_forward = 0

then issue :

sysctl -w net.ipv4.ip_forward=1
net.ipv4.ip_forward = 1if you get the error :

 
docker: Error response from daemon: driver failed programming external connectivity on endpoint amazing_williams (44e256a6039741b20e4124800702d9794d69fb6be9da71ba25059de4dd527121): COMMAND_FAILED: '/sbin/iptables -w2 -t nat -A DOCKER -p tcp -d 0/0 --dport 4443 -j DNAT --to-destination 172.17.0.2:443 ! -i docker0' failed: iptables: <strong>No chain/target/match by that name..</strong>

 

systemctl stop firewalld
systemctl mask firewalld

Created symlink from /etc/systemd/system/firewalld.service to /dev/null.

yum install iptables-services

Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.euserv.net
* epel: fr.mirror.babylon.network
* extras: ftp.fau.de
* updates: centos.fastbull.org
Resolving Dependencies
--> Running transaction check
---> Package iptables-services.x86_64 0:1.4.21-16.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================================================================================================================================================================================
Package Arch Version Repository Size
=============================================================================================================================================================================================================================================
Installing:
iptables-services x86_64 1.4.21-16.el7 base 50 k

Transaction Summary
=============================================================================================================================================================================================================================================
Install 1 Package

Total download size: 50 k
Installed size: 24 k
Is this ok [y/d/N]: y
Downloading packages:
iptables-services-1.4.21-16.el7.x86_64.rpm | 50 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : iptables-services-1.4.21-16.el7.x86_64 1/1
Verifying : iptables-services-1.4.21-16.el7.x86_64 1/1

Installed:
iptables-services.x86_64 0:1.4.21-16.el7

Complete!

systemctl enable iptables

Created symlink from /etc/systemd/system/basic.target.wants/iptables.service to /usr/lib/systemd/system/iptables.service.

service iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ]

try :

docker run -p 800:80 -p 2222:22 -p 4443:443 -it 68715929d32a /bin/bash

Docker log files

Posted on by admin

Ubuntu – /var/log/upstart/docker.log
Boot2Docker – /var/log/docker.log
Debian, GNU/Linux – /var/log/daemon.log
CentOS6 – /var/log/daemon.log | grep docker
Fedora – journalctl -u docker.service
OpenSuSE – journalctl -u docker.service

on Centos 7
journalctl -u docker.service

nJoy 😉

Docker Remote API on CentOS

Posted on by admin

After installing Docker on CentOS we need to Docker remote API port on CentOS.

$ cat /etc/sysconfig/docker
other_args=""

Edit the file /etc/sysconfig/docker as below.

other_args="-H tcp://0.0.0.0:4243 -H unix:///var/run/docker.sock"

After that, restart docker and try to access the host from another host.

$ sudo /etc/init.d/docker restart
...
$ curl $hostname:4243/images/json
...

For a systemd based Distro like Centos7
Linux with systemd (Ubuntu 15.04, Debian 8,…)

Using systemd, we’ll need to enable a systemd socket to access the Docker remote API:

Create a new systemd config file called /etc/systemd/system/docker-tcp.socket to make docker available on a TCP socket on port 2375.

[Unit]
Description=Docker HTTP Socket for the API

[Socket]
ListenStream=2375
BindIPv6Only=both
Service=docker.service

[Install]
WantedBy=sockets.target
Register the new systemd http socket and restart docker
systemctl enable docker-tcp.socket
systemctl stop docker
systemctl start docker-tcp.socket

Open your browser and verify you can connect to http://localhost:2375/_ping

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