Admin: /* Debug Enrypoint */

2025-07-12T16:30:25Z

Debug Enrypoint

← Older revision		Revision as of 16:30, 12 July 2025
Line 410:		Line 410:
	#Debugging		#Debugging
	ENTRYPOINT ["/bin/bash","-c","while [ true ];do sleep 30s;done;"]		ENTRYPOINT ["/bin/bash","-c","while [ true ];do sleep 30s;done;"]

			#Alternative
			CMD ["tail", "-f", "/dev/null"]

	=References=		=References=

Admin at 12:35, 4 January 2024

2024-01-04T12:35:07Z

Show changes

Admin: /* Various Commands */

2023-08-15T15:19:19Z

Various Commands

← Older revision		Revision as of 15:19, 15 August 2023
Line 26:		Line 26:
	docker image prune -a		docker image prune -a
	docker volume prune		docker volume prune
			docker system prune

	*List volume size		*List volume size

Admin: /* Recovery special, example for Splunk */

2023-07-11T07:27:39Z

Recovery special, example for Splunk

← Older revision		Revision as of 07:27, 11 July 2023
Line 364:		Line 364:
	docker container stop shrestore		docker container stop shrestore
	docker container rm shrestore		docker container rm shrestore

			=Dokcer file with Bash Entrypoint=
			ENTRYPOINT ["/bin/bash","-c","while [ true ];do sleep 30s;done;"]

Admin: /* Recovery special, example for Splunk */

2023-06-24T19:20:39Z

Recovery special, example for Splunk

← Older revision		Revision as of 19:20, 24 June 2023
Line 360:		Line 360:
	docker exec -it -u splunk shrestore bash -c "cd /opt/splunk/etc && tar xvf /tmp/docker_splunk-etc.etc.gz --strip 1 "		docker exec -it -u splunk shrestore bash -c "cd /opt/splunk/etc && tar xvf /tmp/docker_splunk-etc.etc.gz --strip 1 "
	docker exec -it -u splunk shrestore bash -c "cd /opt/splunk/var && tar xvf /tmp/docker_splunk-var.tar.gz --strip 1 "		docker exec -it -u splunk shrestore bash -c "cd /opt/splunk/var && tar xvf /tmp/docker_splunk-var.tar.gz --strip 1 "

			*When finished the terminate shrestore
			docker container stop shrestore
			docker container rm shrestore

Admin: /* Recovery special, example for Splunk */

2023-06-24T19:18:20Z

Recovery special, example for Splunk

← Older revision		Revision as of 19:18, 24 June 2023
Line 339:		Line 339:
	*cat /etc/passwd		*cat /etc/passwd
	splunk:x:41812:41812::/home/splunk:/bin/bash		splunk:x:41812:41812::/home/splunk:/bin/bash
	*Create the splunk user on the physical host		*OPTIONAL Create the splunk user on the physical host
	addgroup splunk --gid 41812		addgroup splunk --gid 41812
	adduser splunk --uid 41812 --gid 41812		adduser splunk --uid 41812 --gid 41812

Admin: /* VBind Mount */

2023-06-24T19:17:54Z

VBind Mount

← Older revision		Revision as of 19:17, 24 June 2023
Line 335:		Line 335:
	=VBind Mount=		=VBind Mount=
	*Mention to chown local data dir to appropriate users		*Mention to chown local data dir to appropriate users

			=Recovery special, example for Splunk=
			*cat /etc/passwd
			splunk:x:41812:41812::/home/splunk:/bin/bash
			*Create the splunk user on the physical host
			addgroup splunk --gid 41812
			adduser splunk --uid 41812 --gid 41812

			*Create volume
			docker volume create docker_splunk-etc
			docker volume create docker_splunk-var

			*Mount helper container
			docker run -v docker_splunk-etc:/opt/splunk/etc -v docker_splunk-var:/opt/splunk/var --name shrestore -itd debian:stable-slim /bin/bash
			*Switch into the newly container '''docker exec -it shrestore bash'''
			addgroup splunk --gid 41812
			adduser splunk --uid 41812 --gid 41812
			chown splunk /opt/splunk -R

			*Copy the tar archives from the host
			docker cp /home/vmadmin/restore/backup/docker/volumes/docker_splunk-etc.tar.gz shrestore:/tmp/docker_splunk-etc.etc.gz
			docker cp /home/vmadmin/restore/backup/docker/volumes/docker_splunk-var.tar.gz shrestore:/tmp/docker_splunk-var.tar.gz
			*Then uncompress them
			docker exec -it -u splunk shrestore bash -c "cd /opt/splunk/etc && tar xvf /tmp/docker_splunk-etc.etc.gz --strip 1 "
			docker exec -it -u splunk shrestore bash -c "cd /opt/splunk/var && tar xvf /tmp/docker_splunk-var.tar.gz --strip 1 "

Admin: Created page with "==Various Commands== List container docker container ls -a DELETE ALL IMAGES docker rmi $(docker images -a -q) View Logs of a specific container docker logs foo *Remov..."

2022-12-10T02:40:25Z

Created page with "==Various Commands== List container docker container ls -a DELETE ALL IMAGES docker rmi $(docker images -a -q) View Logs of a specific container docker logs foo *Remov..."

New page

==Various Commands==

List container
docker container ls -a

DELETE ALL IMAGES
docker rmi $(docker images -a -q)

View Logs of a specific container
docker logs foo

*Remove Container
docker rm foo

*Stop all containers
docker stop $(docker ps -a -q)

*Remove all containers
docker rm $(docker ps -a -q)
or
docker container ls -aq | xargs docker container rm
*Remove all images
docker rmi $(docker images -a -q)
*Clean
docker container prune
docker image prune -a
docker volume prune

*List volume size
docker system df

==delete Script==
#!/bin/bash
docker stop $(docker ps -a -q)
docker rm $(docker ps -a -q)
yes | docker rmi $(docker images -a -q)
yes | docker container prune
yes | docker image prune -a
yes | docker volume prune

==Create an easy Ubuntu Container==
*Search for various releases
docker search ubuntu

*Build container and use interactive with bash
docker create --name=foo -it ubuntu bash

*Then start the container
docker start foo

*Then attach to the container, note that this will only work because we have an interactive bash behind
**To exit and stop the container use '''CTRL + D'''
**To exit only use '''CTRL + P + Q'''
docker attach foo

*Alternative run the new Ubuntu container in one shot and attach to it, this will automatically install the image if not already present
**To exit and stop the container use '''CTRL + D'''
**To exit only use '''CTRL + P + Q'''
docker run --name=foo -it ubuntu bash
*Or run detached:
docker run --name=foo -itd ubuntu bash
*And then attach
docker attach ubuntu

==Build an easy Apache2 Container==
===Create the Dockerfile===

root@vm-docker01:~/# mkdir apache

root@vm-docker01:~/# cd apache

root@vm-docker01:~/apache# echo "#Dockerfile sample
#Choose ubuntu or debian
FROM ubuntu
#These images have no apt cache installed yet
RUN apt-get update
#Install apache2
RUN apt-get install apache2-utils apache2 --assume-yes
#Here comes the most important part as we need to init an entrypoint for the container,
#if you don't do this then the container will exit right away
CMD [\"-D\", \"FOREGROUND\"]
ENTRYPOINT [\"apachectl\"]" > Dockerfile

===Build the Image===

*Build a new image named '''apache_image:1.0''', note the dot at the end as this expects the Dockerfile within the current directory
root@vm-docker01:~/apache# '''docker build -t apache_image:1.0 . '''
Sending build context to Docker daemon 18.94kB
Step 1/6 : FROM ubuntu
---> a8780b506fa4
Step 2/6 : RUN apt-get update
---> Running in 2021ece81156
Get:1 http://archive.ubuntu.com/ubuntu jammy InRelease [270 kB]
Get:2 http://security.ubuntu.com/ubuntu jammy-security InRelease [110 kB]
...
...
Fetched 24.6 MB in 2s (12.6 MB/s)
Reading package lists...
Removing intermediate container 2021ece81156
---> 7e2028ae926a
Step 3/6 : RUN apt-get install apache2 --assume-yes
---> Running in 7462500da559
Reading package lists...
Building dependency tree...
Reading state information...
The following additional packages will be installed:
apache2-bin apache2-data apache2-utils bzip2 ca-certificates file libapr1
...
...
The following NEW packages will be installed:
apache2 apache2-bin apache2-data apache2-utils bzip2 ca-certificates file
...
...
Get:1 http://archive.ubuntu.com/ubuntu jammy-updates/main amd64 perl-modules-5.34 all 5.34.0-3ubuntu1.1 [2976 kB]
Get:2 http://archive.ubuntu.com/ubuntu jammy/main amd64 libgdbm6 amd64 1.23-1 [33.9 kB]
...
...
Removing intermediate container 7462500da559
---> 4df992b99ae5
Step 4/6 : RUN apt-get install apache2-utils --assume-yes
---> Running in e11af1c7cd8d
Reading package lists...
Building dependency tree...
Reading state information...
apache2-utils is already the newest version (2.4.52-1ubuntu4.2).
apache2-utils set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Removing intermediate container e11af1c7cd8d
---> 800f1b355425
Step 5/6 : CMD ["-D", "FOREGROUND"]
---> Running in 76635350d8dd
Removing intermediate container 76635350d8dd
---> b24fa728d6d7
Step 6/6 : ENTRYPOINT ["apachectl"]
---> Running in 5d642bc0312a
Removing intermediate container 5d642bc0312a
---> fccb8e6a0568
Successfully built fccb8e6a0568
'''Successfully tagged apache_image:1.0'''

*Check to see if the image is present
root@vm-docker01:~/apache# docker image ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
'''apache_image 1.0 fccb8e6a0568 8 minutes ago 225MB'''
ubuntu latest a8780b506fa4 2 weeks ago 77.8MB

===Start the new buildet image===
*Note the -d flag which says that the container runs detached and note that we map the container port 80 to the real host port 80
root@vm-docker01:~/apache# '''docker run --name myapache -d -p 80:80 apache_image:1.0'''
b4865c05a704055bb3bf080a58f1ee33334b0197bec4d89ce76e4995856879dc
*Note the entrypoint/command which we have specified
root@vm-docker01:~/apache# '''docker container ls'''
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b4865c05a704 apache_image:1.0 "apachectl -D FOREGR…" 51 seconds ago Up 50 seconds 0.0.0.0:80->80/tcp myapache

===Connect to the container===
*Do not use the '''docker attach myapache''' method as the entrypoint will lead into a dead terminal, instead use the interactive method and start a bash
**To exit and stop the container use '''CTRL + D'''
**To exit only use '''CTRL + P + Q'''
root@vm-docker01:~/apache# '''docker exec -it myapache bash'''
root@b4865c05a704:/# ps -e
PID TTY TIME CMD
1 ? 00:00:00 apachectl
15 ? 00:00:00 apache2
16 ? 00:00:00 apache2
17 ? 00:00:00 apache2
72 pts/0 00:00:00 bash
80 pts/0 00:00:00 ps

*Now the webserver should be reachable through the network
root@vm-docker01:~/apache# netstat -tpan | grep 80
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 160554/docker-proxy

==Create an easy mysql container==
*Create a password file
root@vm-docker01:~# '''mkdir ./secrets'''
root@vm-docker01:~# '''echo "Passwd" > ./secrets/mysql-root-password'''
*Create the mysql container using the above passwd file, alos create an extra volume to keep the database persistant
root@vm-docker01:~# '''docker run --name mysql -d \
-p 3306:3306 \
-e MYSQL_ROOT_PASSWORD_FILE=/run/secrets/mysql-root-password \
-v /root/secrets:/run/secrets \
-v mysql:/var/lib/mysql \
mysql:8'''

*Connect to the container and run mysql, you can the create your database, user and so on
root@vm-docker01:~# '''docker exec -it mysql mysql -p'''
Your MySQL connection id is 8
Server version: 8.0.31 MySQL Community Server - GPL

Copyright (c) 2000, 2022, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> create database mydatabase;
Query OK, 1 row affected (0.03 sec)

mysql> CREATE USER 'myuser'@'%' IDENTIFIED BY 'mypwd';
Query OK, 0 rows affected (0.03 sec)

mysql> GRANT ALL PRIVILEGES ON mydatabase.* TO 'myuser'@'%';
Query OK, 0 rows affected (0.01 sec)

mysql> ALTER USER 'myuser'@'%' IDENTIFIED WITH mysql_native_password BY 'mypwd';
Query OK, 0 rows affected (0.01 sec)

mysql> quit

*Mysql is now ready on port 3306
root@vm-dev01:~# '''docker container ls'''
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
62b28b965c54 mysql:8 "docker-entrypoint.s…" 9 minutes ago Up 8 minutes 0.0.0.0:3306->3306/tcp, :::3306->3306/tcp, 33060/tcp mysql

==Build an easy msql container==

root@vm-docker01:~/# mkdir mysql
root@vm-docker01:~/# cd mysql

*Create a sample sql init script which we run during the container init
root@vm-docker01:~/mysql # echo "#mysql script sample
create database mydatabase;
CREATE USER 'myuser'@'%' IDENTIFIED BY 'mypwd';
GRANT ALL PRIVILEGES ON mydatabase.* TO 'myuser'@'%';
ALTER USER 'myuser'@'%' IDENTIFIED WITH mysql_native_password BY 'mypwd'; "> init.sql

root@vm-docker01:~/mysql # echo "#Dockerfile sample
#Get the mysql version 8 image
FROM mysql:8
#Set the root pw during init, alternative use the /run/secrets option from above
ENV MYSQL_ROOT_PASSWORD=Pass123
#Copy one or more sql init files to the container entrypoint
COPY init.sql /docker-entrypoint-initdb.d/" > Dockerfile

*Build the msql Image
root@vm-docker01:~/mysql# docker build -t mysql_image:1.0 .
Sending build context to Docker daemon 3.072kB
Step 1/3 : FROM mysql:8
8: Pulling from library/mysql
0bb5c0c24818: Pull complete
...
ad655e218e12: Pull complete
Digest: sha256:96439dd0d8d085cd90c8001be2c9dde07b8a68b472bd20efcbe3df78cff66492
Status: Downloaded newer image for mysql:8
---> 3842e9cdffd2
Step 2/3 : ENV MYSQL_ROOT_PASSWORD=Pass123
---> Running in 655ef85c56db
Removing intermediate container 655ef85c56db
---> 208553d8cba2
Step 3/3 : COPY init.sql /docker-entrypoint-initdb.d/
---> 1cc6b668c6e1
Successfully built 1cc6b668c6e1
Successfully tagged mysql_image:1.0

*Run the new container
root@vm-docker01:~/mysql# docker run --name mysql -d -p 3306:3306 mysql_image:1.0
ade81568e9e77b8c87834f3422f23886e8b7251a8f3402f85d4d7f31c2877fcd

root@vm-docker01:~/mysql# docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
ade81568e9e7 mysql_image:1.0 "docker-entrypoint.s…" 2 minutes ago Up 2 minutes 0.0.0.0:3306->3306/tcp, :::3306->3306/tcp, 33060/tcp mysql

=Using docker-compose=

This would be the docker-compose.yml file to build the above apache and mysql container
*To build
** docker-compose build
** docker-compose build -d MyProjectName (Otherwise the current directory will be used to prefix volumes)
*To View
**docker-compose logs
**docker-compose logs -f

*To start/stop
** docker-compose up -d
** docker-compose down
version: '3.0'
services:
apache:
image: "apache_image:1.0"
container_name: apache
hostname: apache
build:
context: ./apache
ports:
- "80:80"

mysql:
image: "mysql_image:1.0"
container_name: mysql
hostname: mysql
volumes:
- mysql:/var/lib/mysql
build:
context: ./mysql
ports:
- "3306:3306"

volumes:
mysql: null

=Backup/Restore=

==Backup Volume==
*Create a temporary Container and mount the volume, make sure that no one else is suing the volume
docker run -v <volume_name>:/dbdata --name dbstore -itd ubuntu /bin/bash
*Backup the data
docker run --rm --volumes-from dbstore -v $(pwd):/backup ubuntu tar cvf /backup/backup.tar /dbdata
Or gz
docker run --rm --volumes-from dbstore -v $(pwd):/backup ubuntu tar czvf /backup/backup.tar.gz /dbdata

==Restore Volume==
*Create a temporary Container and mount the volume, make sure that no one else is suing the volume
docker run -v <volume_name>:/dbdata --name dbstore2 -itd ubuntu /bin/bash
docker run --rm --volumes-from dbstore2 -v $(pwd):/backup ubuntu bash -c "cd /dbdata && tar xvf /backup/backup.tar --strip 1"

=Backup Image=
docker save mysql_image:1.0 apache_image:1.0 -o mybackup.tar.gz

=Restore Image=
docker load -i mybackup.tar.gz

=VARS=
*Sample
ARG MY_JAR=myJar.jar # ARG is only available during the build of a Docker image
COPY bin/$MY_JAR $ORACLE_HOME/user_projects/domains/$DOMAIN_NAME/lib/
COPY bin/$MY_JAR $ORACLE_HOME/wlserver/server/lib/mbeantypes/

=VBind Mount=
*Mention to chown local data dir to appropriate users

Docker cheat sheet - Revision history

Admin: /* Debug Enrypoint */

Admin at 12:35, 4 January 2024

Admin: /* Various Commands */

Admin: /* Recovery special, example for Splunk */

Admin: /* Recovery special, example for Splunk */

Admin: /* Recovery special, example for Splunk */

Admin: /* VBind Mount */

Admin: Created page with "==Various Commands== List container docker container ls -a DELETE ALL IMAGES docker rmi $(docker images -a -q) View Logs of a specific container docker logs foo *Remov..."