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Configure journalctl

Configuring journalctl

It is useful to use journalctl because it normalizes log timestamps and can show multiple different server's entries in a time sorted log.

Increasing retention

Edit /etc/systemd/journald.conf:

# 10x more overall storage
SystemMaxUse=40G

# 10x more burst capacity
RateLimitBurst=100000

# 10x more journal files
SystemMaxFiles=1000

Restart

sudo systemctl restart systemd-journald

Useful commands

# limit to one service
journalctl -u vls-testnet.service

# select time range
journalctl --since "YYYY-MM-DD HH:MM:SS" --until "YYYY-MM-DD HH:MM:SS"

# how much disk is used?
journalctl --disk-usage

# what is the earliest entry?
journalctl | head