journalctl command to see kernel messages

2017-01-30 1 min read Fedora
Sometimes, there are just too many messages in journalctl output and it becomes a mystery game to search for the messages you are looking for. But luckily you do not need to use grep to find the right message. Here is example of what I had to do when I was looking for kernel messages. journalctl _TRANSPORT=kernel # To see all the fields, you can use the verbose mode journalctl _TRANSPORT=kernel -o verbose # And the filter on priority if needed to get the messages you need journalctl _TRANSPORT=kernel PRIORITY=4 # and follow journalctl _TRANSPORT=kernel PRIORITY=4 -f -l

speed up journalctl

2016-04-25 1 min read Fedora
Sometime back I noticed that whenever I run my favourite command, viz. journalctl -xn -f -l it was taking more time than usual. So, I thought to dig more into it and finally found that the following command: sudo journalctl --disk-usage showed that journalctl was using some huge space in tune of about 4GB. So, the solution was simple, vaccum the journal entries and the command to do so is : Continue reading