Docker: Difference between revisions
→RancherOS
(page created) |
|||
| (29 intermediate revisions by the same user not shown) | |||
Line 1:
[[Category:Virtualization]]
__TOC__
<br />
= Basics =
*Docker Components:
- Image: Content at rest, Not the full OS, but just the basic environment
- Container: Running Image
- Engine: Software that executes commands for containers. Networking & Volumes are part of Engine.
- Registry: Stores, Distributes & Manages docker images.
- Control Plane: Management Plane for Container & Cluster Orchestration.
*Container Orchestration:
- Docker Swarm
- [[Kubernetes]]
- Mesos Marathon
- Cloud Foundry Diego
- Amazon ECS
- Azure Container Service
= Installation =
Source: [https://linuxconfig.org/mediawiki-easy-deployment-with-docker-container linuxconfig.org]
sudo apt-get update
sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
Line 19 ⟶ 42:
docker run hello-world
docker search ubuntu
= Removing Images =
Find out the Image ID:
docker images
Delete the Image:
docker rmi -f d9790ed1a768
To view all containers — active and inactive:
docker ps -a
Stopping a running or active container:
docker stop <container-id>
Removing a Container:
docker rm <container-id>
Delete all containers:
docker rm $(docker ps -a -q)
Delete all images:
docker rmi $(docker images -q)
Force delete all images (even with linked containers):
docker rmi $(docker images -q) --force
Remove all stopped containers, unused volumes, unused networks, all images without at least one container associated to them:
docker system prune -a -f
= Installing MediaWiki =
docker search mediawiki
docker run -d --name=mediawiki -p 80:80 linuxconfig/
docker ps
Running same container again on next reboot
docker start mediawiki
;Databases Credentials
Default Mysql credentials are:
admin
pass
Use the following command to update or reset MariaDB user password. The below command will set a new admin user password:
docker exec -it mediawiki mysqladmin -uadmin -ppass password abc123
To create a new database eg. mediawiki2 enter:
docker exec -it mediawiki mysqladmin -uadmin -ppass create mediawiki2
Use the below command to copy the LocalSetting.php file from host to Docker:
docker cp LocalSettings.php mediawiki:/var/www/html/LocalSettings.php
= Nginx =
Source: [https://www.digitalocean.com/community/tutorials/how-to-run-nginx-in-a-docker-container-on-ubuntu-14-04 digitalocean.com]
Create nginx root directory:
mkdir -p ~/docker-nginx/html
cd ~/docker-nginx/html
nano index.html
Paste below contents into this file
<pre>
<html>
<body style="background-color:green">
<head>
<title>Green Site - Docker </title>
</head>
<body>
<div class="container">
<h1> GREEN WEBSITE</h1>
<p> This is GREEN Website.</p>
<p> Its color is also GREEN.</p>
</div>
</body>
</html>
</pre>
Install nginx image for docker
docker search nginx
Run nginx docker image with auto Restart on reboot option
docker run --name nginx -p 80:80 -d -v ~/docker/nginx/html:/usr/share/nginx/html --restart unless-stopped nginx
Docker currently has four restart policies[https://blog.codeship.com/ensuring-containers-are-always-running-with-dockers-restart-policy/]:
no
on-failure
unless-stopped
always
;Multiple Instances
Create copies of root directory for different servers:
cp -r ~/docker/nginx/ ~/docker/nginx8080/
cp -r ~/docker/nginx/ ~/docker/nginx8081/
cp -r ~/docker/nginx/ ~/docker/nginx8082/
cp -r ~/docker/nginx/ ~/docker/nginx8083/
Edit the Index.html file to reflect different content by editing the html code.
Start different instances of nginx to start with different ports & root directories:
docker run --name nginx8081 -p 8081:80 -d -v ~/docker/nginx8081/html:/usr/share/nginx/html nginx
docker run --name nginx8082 -p 8082:80 -d -v ~/docker/nginx8082/html:/usr/share/nginx/html nginx
docker run --name nginx8083 -p 8083:80 -d -v ~/docker/nginx8083/html:/usr/share/nginx/html nginx
docker run --name nginx8084 -p 8084:80 -d -v ~/docker/nginx8084/html:/usr/share/nginx/html nginx
Nginx instances should now be available using below links:
http://<IP_of_Server>:8081
http://<IP_of_Server>:8082
http://<IP_of_Server>:8083
http://<IP_of_Server>:8084
;Changing port or running custom config:
Copy the nginx file from docker file system to local filesystem:
sudo docker cp nginx:/etc/nginx/conf.d/default.conf /home/aman/docker/default.conf
Edit the config file to change the listening port to 8000:
nano default.conf
Now start the docker container with the new port:
docker run --name docker-nginx -p 8081:8000 -v ~/docker/nginx8081/html:/usr/share/nginx/html -v ~/docker/default.conf:/etc/nginx/conf.d/default.conf -d nginx
;Running multiple instances with custom ports & autostart on bootup:
<pre style="width: 97%; overflow-x: scroll;">
docker run --name nginx8081 -p 8081:8000 -d -v ~/docker/nginx8081/html:/usr/share/nginx/html -v ~/docker/default.conf:/etc/nginx/conf.d/default.conf --restart unless-stopped nginx
docker run --name nginx8082 -p 8082:8000 -d -v ~/docker/nginx8082/html:/usr/share/nginx/html -v ~/docker/default.conf:/etc/nginx/conf.d/default.conf --restart unless-stopped nginx
docker run --name nginx8083 -p 8083:8000 -d -v ~/docker/nginx8083/html:/usr/share/nginx/html -v ~/docker/default.conf:/etc/nginx/conf.d/default.conf --restart unless-stopped nginx
docker run --name nginx8084 -p 8084:8000 -d -v ~/docker/nginx8084/html:/usr/share/nginx/html -v ~/docker/default.conf:/etc/nginx/conf.d/default.conf --restart unless-stopped nginx</pre>
=Ntop=
Downloading and installing image first time
docker pull lucaderi/ntopng-docker
docker run --net=host --name ntopng -t -i lucaderi/ntopng-docker ntopng -v
Let it run for few minutes.<br/>
Now press Control+C keys to terminate the process.<br/>
Now to start it type the below command:
docker start ntopng
<br/>
= RancherOS =
Source: [http://docs.rancher.com/os/running-rancheros/server/install-to-disk/ rancher.com]
Create a VM with atleast 1.5 GB RAM
Boot the following ISO file:
https://releases.rancher.com/os/latest/rancheros.iso
Perform basic networking using below commands:
sudo ifconfig eth0 inet 10.10.10.10 netmask 255.255.255.0 broadcast 10.10.10.255
sudo route add default gw 10.10.10.1
sudo vi /etc/resolv.conf
nameserver 10.10.10.5
Check Internet connectivity
ping google.com
Install RancherOS
sudo ros install -d /dev/xvda
Set the persistent networking:
sudo vi /etc/networking/interfaces
Install Linux-dash, a minimal low-overhead web dashboard for monitoring Linux servers
sudo system-docker run -d --net=host --name busydash husseingalal/busydash
WebUI Access:
http://<IP_OF_MACHINE>
Default password is blank for user 'rancher'. Change it for SSH login:
passwd
SSH Login:
ssh-keygen
= Docker Packet Captures =
docker exec -it 428947239426349 tcpdump -N -A 'port 80' -w capture.pcap
<br />
;References
<references/>
<br />
<br />
<br />
{{DISQUS}}
| |||