Can I delete files in /var/log/journal ?

Can I delete files in /var/log/journal ?

/var/log/journal/ are kept the log files created by the journal service (systemd). Yes, the files from /var/log/journal directory can be removed.

1. If /var/log/journal log file using more space like 3.5G etc.. 

We can verify it by running below command:

# journalctl --disk-usage

2. Note down the SystemMaxUse value, it could be hashed or having value like 3.5G

#cat /etc/systemd/journald.conf |grep -i SystemMaxUse

3. Before editing journald.conf file; take copy of it

#cp -rp /etc/systemd/journald.conf /etc/systemd/journald.conf_backup

4. Edit the file journald.conf using vi editor and change the value SystemMaxUse to 200 or 300MB

#cat /etc/systemd/journald.conf |grep -i SystemMaxUse

SystemMaxUse=300M

5. Restart the systemd-journald service to make the changes effective done in /etc/systemd/journald.conf

#systemctl restart systemd-journald

Or

If you do not want to restart the systemd-journald service then use below command :

#journalctl –vacuum-size=300M 

Thanks,

Kiraan B Jadhav

/boot housekeeping + linux

/boot is almost full + linux

It is recommended to have at least 1GB of space for /boot.  

The safest way of cleaning up /boot is :

Do the following to keep just the last 2 kernels on your system, to keep /boot clean.

1 - Edit /etc/yum.conf and set the following parameter

# vi /etc/yum.conf

installonly_limit=2

This will make your package manager keep just the 2 last kernels on your system(including the one that is running)

 

2 - Install yum-utils utility so the package-cleanup command will work:

# yum install yum-utils

 

3 - Make an oldkernel cleanup:

# package-cleanup --oldkernels --count=2

4. This will clear lots of space. If not, then we can note down the current kernel version and can move the other kernels files to another directory.

To know current version of kernel:

# uname -r

Or

# rpm -qa kernel

Move other kernel files to another directory

# mv /boot/<file name> /root/oldkernels

 

Regards,

Kirraan Jadhav