Although the simple ‘gcloud container operations list‘ command is the easiest way to find recent upgrade events on your GKE cluster or nodepool, it returns only the recent events and does not provide a historical record. If you need to look at historical events, you can use Logs Explorer web UI or use the ‘gcloud … GCP: historical log of GKE cluster and nodepool upgrades and scaling
Iptables is a powerful utility for controlling network traffic coming through your host. But writing the rules that control the flow can be hard to troubleshoot when you have a complex network and multiple host interfaces. Luckily, you have the ability to insert log rules wherever necessary to get visibility into the packets flowing through … Ubuntu: Debug iptables by inserting a log rule
Syslog is a message logging standard has been around for decades, but has renewed popularity as a method of log capture with the advent of containerization and centralized logging solutions. Enabling an Ubutu 14.04 or 16.04 host to act as a syslog server only takes a few simple steps.
Docker log collection can be done using various methods, one method that is particularly effective is having a dedicated container whose sole purpose is to automatically sense other deployed containers and aggregate their log events. This is the architectural model of logspout, an open-source project that acts as a router for the stdout/stderr logs of other containers. If you do … Docker: logspout for Docker log collection
When troubleshooting basic connectivity from your SaltStack minions to your Salt master, the first thing to remember is the basic flow – the minions initiate the connection to port 4505/4506 on the Salt master. With this in mind, if you have modified /etc/salt/minion so that the master is explicitly set and logs are set to … SaltStack: Troubleshooting Basic Network Connectivity of Minion on Ubuntu
In my previous posts, I have shown how to test grok patterns locally using Ruby on Linux and Windows. This works well when your VM do not have full internet access, or only have console access, or any reason that you want to test it locally. If you have access to a graphical web browser … Logstash: Testing Logstash grok patterns online