Docker Fixes
Dockerized GUI app hangs periodically
When you have X11 hung seemingly at random on big GUI updates (like fading) try running the container with host network --net=host to take networking out of the picture.
I've seen GTK apps cause it on the bridged adapters, while QT worked fine.
Problems with swarm networking and windows
- Endpoint_mode: dnsrr is a limitation of the windows docker right now, The VIP mode is more flexible, but does not work yet. https://docs.microsoft.com/en-us/virtualization/windowscontainers/manage-containers/swarm-mode
- About VIP and the service mesh - https://docs.docker.com/engine/swarm/ingress/
- About DNSRR - https://docs.docker.com/engine/swarm/networking/#configure-service-discovery
- Ports are published to the node host because of the use of dnsrr. Read about the limitations here:
- More documentation on that issue - https://github.com/docker/swarmkit/issues/1429
- Windows docker networking - https://docs.microsoft.com/en-us/virtualization/windowscontainers/manage-containers/container-networking
Can not ping containers across multiple hosts in an swarm overlay network
Check for overlay networking is your firewall rules. You need the following open between the hosts:
The swarm port, usually 2377/tcp, this is most likely already done
The overlay control port 7946/tcp and 7946/udp
The overlay data port 4789/udp
The overlay control port 7946/tcp and 7946/udp
The overlay data port 4789/udp
Troubleshooting windows container hosts
iwr https://aka.ms/Debug-ContainerHost.ps1 -UseBasicParsing | iex
Docker log location
Ubuntu (new using systemd ) - sudo journalctl -fu docker.service and tailf /var/log/syslog also run docker events
Windows - Get-EventLog -LogName Application -Source Docker -After (Get-Date).AddMinutes(-5) | Sort-Object Time
