Ravi Sir's Cards › AWS
dmesg vs journalctl
What is a VPC: your own private network inside one AWS Region, example ThreeTierVpc 10.0.0.0/16.
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What this card says
Source
dmesg
Kernel ring buffer.
journalctl
All systemd logs.
Key points
Lost on reboot.
Can persist across boots.
Example
dmesg -T
Use when
Disk, driver, OOM.
Services, previous boot.