Microsoft SQL Server 2019 Express Docker image Example

Hi Folks,

Today I am going to explain the procedure for connecting to a Microsoft SQL Server 2019 Express edition docker image

Pre-requisites

1. Docker Desktop
2. Windows OS
3. Powershell/command prompt

Procedure

Get and run docker image

> docker run -e "ACCEPT_EULA=Y" -e "SA_PASSWORD=<Your_Password>" -e "MSSQL_PID=Express" --name "<Your_SQL_Server_Name>" -p 1433:1433 -d mcr.microsoft.com/mssql/server:2019-latest

Command information

Remove the "MSSQL_PID=Express" to run other version of SQL Server

Replace 2019 with required SQL Server version

Password should be atleast 8 characters with capital, small, numeric, special character combination

Use different port if you already have a local sql server

Name should not contain spaces

Check for docker container

> docker ps

You should able to see the container with your SQL Server name at the end in running status

Connect to SQL Server

docker exec -it "<Your_SQL_Server_Name>" /opt/mssql-tools/bin/sqlcmd -S localhost -U SA -P "<Your_Password>"

You should be able to see "1>" prompt

Command information

Use the SQL Server name or user the container ID

Use database and play around with table(s)

Important

Multiple commands can be entered one after one, but to execute the set of command(s), you need give "GO" command.

Create Database

CREATE DATABASE SampleDB

GO

List all databases

SELECT Name from sys.Databases

GO

Start using the database

USE SampleDB

GO

Create table

CREATE TABLE UserInfo ( Id INT, Name VARCHAR(64))

GO

Insert values

INSERT INTO UserInfo (1, 'ABC')

GO

Retrieve table contents

SELECT * FROM UserInfo

GO

Exit from SQL Server

QUIT

Hope you are able to run the SQL Server Docker image.

Please send your feedback and comments to psrdotcom@gmail.com

Connect to public hosted Ubuntu server MySQL Docker Image from local MySQL Workbench

Hi folks,

Today I am going to explain the procedure to test the public cloud hosted MySQL docker in Ubuntu Server to your local MySQL WorkBench.

We configured a Ubuntu Server on public cloud and installed docker.
Ping the public IP address to make sure, it is reachable to your pc/laptop.

Configure System

Install MySQL Docker Image

# docker pull mysql/mysql-server:latest

Check the images

#docker images

You should be able to view the downloaded mysql server image

Start the MySQL Server

# docker run --name=mysql1 -p 33061:3306 -d mysql/mysql-server
-d : Run in daemon mode
-p host_port:container_port
--name: container name

The mapped public ubuntu server port is 33061, which is mapped to the mysql server port 3306.

Check the containers

# docker ps

You should be able to view your mysql docker containers with container id and ports information

Get the MySQL root user password

MySQL generates a one-time password for docker container and writes to the log.

• To view the log, execute the following command

# docker logs mysql1

• To get the generate one-time password, filter the log with keyworkd "GENERATED"

# docker logs mysql1 2>&1 | grep GENERATED

• You should be able to get the line like below

GENERATED ROOT PASSWORD: Axegh3kAJyDLaRuBemecis&EShOs

• Copy the one-time password. In the next step, we will use this to login.

Reset MySQL root user password

• Connect to MySQL server

# docker exec -it mysql1 -uroot -p

• Paste the generated root password
• Change the password

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'yourpwd';
mysql> FLUSH PRIVILEGES;

• Though you have the root user credentials, you won't be able to connect.

Root cause: root user belongs to localhost, not for the public host usage
Solution: create another user with all privileges

mysql> CREATE USER 'username'@'%' IDENTIFIED BY 'youpwd';
mysql> GRANT ALL PRIVILEGES on *.* TO USER 'username'@'%' WITH GRANT OPTION;
mysql> FLUSH PRIVILEGES;

• Exit the mysql

mysql> exit;

• Restart the docker

# docker restart mysql1

Connect from MySQL Workbench

1. Open MySQL Workbench
2. Click on add new connection icon
3. Enter the "Connection name"
4. Enter host name "public IP address" or "URL"
5. Enter username as "dev" (Above created user)
6. Click on Password "Store in vault" button and enter the "dev" user password
7. Click on "Test Connection" button
8. You should be able to view the "Successfully made the SQL Connection" pop-up

Hope this tutorial helps you to get connected with your public hosted mysql docker instance to your local mysql workbench.

Please send your feedback and comments to psrdotcom@gmail.com

View docker image file content with folder structure

Hi folks,

I have come across a scenario where I need to see the image contents.

Yes, I want to view the image content with hierarchy.

Then I found this dive, which has done it beautifully.

Install on Ubuntu PC

1. # wget https://github.com/wagoodman/dive/releases/download/v0.9.2/dive_0.9.2_linux_amd64.deb
2. # sudo apt install ./dive_0.9.2_linux_amd64.deb

Usage

• Get the docker images list
• # docker image list
• Choose the image which you want to explore by copying the "Repository" name
• Run the command
• # dive
• It takes some time to analyse and display the image contents in hierarchical manner.
• Of the left side, it will have the image layers
• Select the appropriate image layer with up/down arrow keys
• By pressing the "Tab" you will be able to switch to right side view where your files are available
• Use space to expand/collapse the folder
• Dive will display each folder size
• See the sample docker image contents with dive below

• To quit/exit from the dive, use Ctrl+C

Hope this is helpful

Please send your feedback and comments to psrdotcom@gmail.com

Docker postgres db to local volume/drive for persistent storage permanently

Hi all,

Today, I would be explaining the way to maintain the DB with data persistent when connecting to docker.

System Status

Postgresql DB container is in Docker
Windows 10 PC
Linux containers

Issue

Whenever I restart docker/PC the database wiped off due to container is stopped.

Solution

Create a docker volume

Syntax: docker volume create <>
Example: docker volume create pgdata

Start the container with volume option

Syntax: docker run --rm --name <> -e POSTGRES_PASSWORD=<> -d -p 5432:5432 -v <>:/var/lib/postgresql/data <>
Example: docker run --rm --name pgcontainer -e POSTGRES_PASSWORD=MyPassword -d -p 5432:5432 -v pgdata:/var/lib/postgresql/data postgres

Now, you can run all your database commands

Upon restart also, your data should be safe.

Thanks for reading the blog post.

Please send your feedback and comments to psrdotcom@gmail.com