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Docker

Table of contents

  1. Docker commands
    1. Containers
      1. List Containers
      2. Start Containers
      3. Stop Containers
      4. Remove Containers
      5. Rename Containers
      6. Get container info
      7. Get container ip address
      8. Copy a local file to the container
    2. Images
      1. Search Image with name
      2. Restart Container (i.e., if unhealthy)
      3. List Images
      4. Remove Images
    3. Networking
      1. Create a bridge (nat) network to connect containers to host
      2. Create container in created nat network
      3. Connect docker container to a recently created nat network
    4. Events Logs
      1. Get the latest application logs from the container
      2. Get the message for each log
    5. Other
      1. Open new Powershell window in Container
      2. Connect to SQL from Powershell window in Container
      3. Import bacpac file using sqlpackage
      4. Create User Login in Docker SQL, from Powershell window in Container
      5. Expose new port from existing container
  2. Troubleshooting

Docker commands

Containers

List Containers

  • docker container ls

    More info: https://docs.docker.com/engine/reference/commandline/container_ls/

  • docker ps

    Lists all running containers

    More info: https://docs.docker.com/engine/reference/commandline/ps/

  • docker ps –all
  • docker ps -a

    Lists all containers

Start Containers

  • docker start

Stop Containers

  • docker stop

Remove Containers

  • docker rm

Rename Containers

  • docker rename

Get container info

  • docker inspect

Get container ip address

  • docker inspect -f “.IPAddress”

Copy a local file to the container

  • docker cp ":"

    docker cp "C:\Temp\FileToCopy.txt" "container_foo:FileToCopy.txt"
    

Images

Search Image with name

  • docker search busybox

Restart Container (i.e., if unhealthy)

  • docker restart

List Images

  • docker images

Remove Images

  • docker rmi

Networking

Create a bridge (nat) network to connect containers to host

(Note that this network must have access to the internet and the dns server when defined otherwise you may have network issues)

  • docker network create -d nat --subnet --gateway
docker network create -d nat dockernat --subnet 172.16.1.0/16 --gateway 172.16.1.1

Create container in created nat network

Use the following parameters in docker run command:

  • –network

    --network dockernat
    
  • –network --ip

    --network dockernat --ip 172.16.1.2
    

Connect docker container to a recently created nat network

  • docker network connect -ip
docker network connect --ip 172.16.1.2 dockernat bcsandbox15latest

Note: if you’re having issues with Docker containers connecting to the host or to the internet, first try to disable the firewall in the host.

Note 2: To get the host ip from the container, use this host.docker.internal (https://docs.docker.com/docker-for-windows/networking/#use-cases-and-workarounds)

Note 3: Configure the firewall with these rules:

  • ICMP rule to allow the docker container to ping the host
    • Protocols and ports: ICMPv4
    • Scope: Local IP Addresses = Remote IP Addresses = ip retrieved by the host.docker.internal address
  • Rule to allow the docker container to connect to a IIS website in port 49001
    • Protocols and ports:
      • Protocol Type: TCP
      • Local ports = Specific ports = 49001
      • Remote ports = All ports
    • Scope: Local IP Addresses = Remote IP Addresses = ip retrieved by the host.docker.internal address

Note 4: if you’re having issues with Docker resolving DNS addresses, take a look at this url: http://www.robertbird.co.uk/development/docker-networking-tips-and-tricks

Events Logs

Note: First create a Powershell session to the container (docker exec -it powershell)

Get the latest application logs from the container

Get-Eventlog -newest

Get-Eventlog -newest 20 application

Get the message for each log

(Get-Eventlog -index ).message

(Get-Eventlog -index 7004 application).message

More info: https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.management/get-eventlog?view=powershell-5.1

Alternative: Check this link: https://www.hougaard.com/get-an-eventlog-from-a-docker-container/

Other

Open new Powershell window in Container

docker exec -it powershell

docker exec -it 8e0967a5b798 powershell

Connect to SQL from Powershell window in Container

SQL user = sa

SQL password =

sqlcmd

Import bacpac file using sqlpackage

sqlpackage.exe /a:Import /sf:.bacpac /tsn: /tdn: /tu: /tp:

sqlpackage.exe /a:Import /sf:C:\Temp\NAVBC_V14_CU2_SS.bacpac /tsn:192.168.187.101 /tdn:CRONUS /tu:<username> /tp:<Password>

Create User Login in Docker SQL, from Powershell window in Container

CREATE LOGIN <loginname> WITH PASSWORD = 'WRITE PASSWORD HERE';
GO
CREATE USER <loginname> FOR LOGIN <loginname>;
GO

use master
GO

Changed database context to 'master'.
ALTER ROLE db_owner ADD MEMBER <loginname>
GO

use CRONUS
GO

Changed database context to 'CRONUS'.
ALTER ROLE db_datareader ADD MEMBER <loginname>
GO

Expose new port from existing container

  • Shutdown Docker Engine.

  • Find your container path in C:\ProgramData\Docker\containers. Your docker id should match the first characters of one of the folders.

  • Edit config.v2.json file, adding the new port to ExposedPorts section.

Example

  • Before: “ExposedPorts”:{“1433/tcp”:{},”443/tcp”:{},”7045/tcp”:{},”7046/tcp”:{},”7047/tcp”:{},”7048/tcp”:{},”7049/tcp”:{},”80/tcp”:{},”8080/tcp”:{}}
  • After: “ExposedPorts”:{“1433/tcp”:{},”443/tcp”:{},”7045/tcp”:{},”7046/tcp”:{},”7047/tcp”:{},”7048/tcp”:{},”7049/tcp”:{},”80/tcp”:{},”8080/tcp”:{},“4032/tcp”:{}}

Note: It’s possible to do the same for Port Binding. Port Binding is in hostconfig.json file. Syntax: “PortBindings”:{“4032/tcp”:[{“HostIp”:””,”HostPort”:”4032”}]}

Troubleshooting

It should be possible to call a rest method from the container to a host url but not if you’re publishing from Visual Studio to IISExpress. Publish it and run it in a IIS website instead.

The host address is ‘host.docker.internal’, which automatically translates to the correct ip.

Invoke-RestMethod ‘http://host.docker.internal:49000/api/guid’’