June 30, 2020

[Note] restore apt-get remove'd package

From https://serverfault.com/questions/380856/how-to-undo-apt-get-remove


echo '#!/bin/bash' > restore
echo sudo apt-get install `grep Remove /var/log/apt/history.log | tail -1 | sed -e 's|Remove: ||g' -e 's|([^)]*)||g' -e 's|:[^ ]* ||g' -e 's|,||g'` >> restore
chmod +x restore
./restore

[Note] DB2 in Docker

Before moving to Ubuntu, I set up DB2 in VBox on Win10 + Ubuntu 18 VM.
https://blog.keithkim.com/2020/02/note-install-db2-express-c-on-ubuntu-18.html

With Ubuntu + Docker -- things are a lot easier.  See below:

Steps


[1] Get DB2 docker image

$ docker pull ibmcom/db2


[2] Create database volume directory

$ mkdir -p /data/db/db2


[3] Run DB2

$ docker run -itd --name db2 --privileged=true -p 50000:50000 -e LICENSE=accept -e DB2INST1_PASSWORD=<choose an instance password> -e DBNAME=testdb -v /data/db/db2:/database ibmcom/db2



[4] Monitor

$ docker logs -f db2

Wait until DB2 is running and database is created.


Misc

Connect to DB2 container:

$ docker exec -ti db2 bash -c "su - db2inst1"



REFERENCE

June 29, 2020

[Note] Oracle in Docker

I've moved to Ubuntu (20.04 ) from Windows 10.  On Windows, I used VirtualBox + CentOS for running Oracle DB.  More modern way is using docker -- and here is a note on installing it.  Since there is no Oracle database Xe docker image you can download.  It requires to build and it's pretty simple.

Steps


[1] Download Oracle XE

https://www.oracle.com/database/technologies/xe-downloads.html

I got 18c Express for Linux x64,
https://download.oracle.com/otn-pub/otn_software/db-express/oracle-database-xe-18c-1.0-1.x86_64.rpm

[2] Get docker image builder code from github, created by Oracle

$ git clone https://github.com/oracle/docker-images.git

[3] Build docker image

Copy the downloaded Oracle RPM file file to this directory of the code that's from github,

$ cp ~/Download/racle-database-xe-18c-1.0-1.x86_64.rpm ~/workspace/local/docker-images/OracleDatabase/SingleInstance/dockerfiles/18.4.0

$ cd ~/workspace/local/docker-images/OracleDatabase/SingleInstance/dockerfiles
 

$ ./buildDockerImage.sh -v 18.4.0 -x

[4] Verify

(base) [email protected]:~/workspace/local/docker-images/OracleDatabase/SingleInstance/dockerfiles$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
oracle/database     18.4.0-xe           072b9c161782        2 hours ago         5.87GB
oraclelinux         7-slim              7442ca158991        2 weeks ago         120MB


[5] Run

$ docker run --name oracledb -d -p 51521:1521 -p 55500:5500 -e ORACLE_PWD=<your new admin pw> -e ORACLE_CHARACTERSET=AL32UTF8 oracle/database:18.4.0-xe


For more detailed step by step, see this page:
https://blogs.oracle.com/oraclemagazine/deliver-oracle-database-18c-express-edition-in-containers

 

REFERENCE





[Note:Ubuntu] move docker storage location

Default docker image location => /var/lib/docker
Want to move it to => /data/docker

$ sudo -i
$ systemctl stop docker

$ vi /lib/systemd/system/docker.service

Find this line:
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

Change it to:
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock -g /data/docker

$ mkdir -p /data/docker
$ rsync -aqxP /var/lib/docker/ /data/docker

$ systemctl daemon-reload
$ systemctl start docker


Check the change:

$ ps aux | grep -i docker | grep -v grep
root       32597  4.0  0.1 1082988 82332 ?       Ssl  14:24   0:00 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock -g /data/docker


Reference: