Check SMART disk health linux
SMART overall health and key failure indicators
smartctl -a /dev/sda | grep -E 'SMART overall|Reallocated|Pending|Uncorrectable'
more linux
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Benchmark sequential disk IO
dd if=/dev/zero of=/tmp/testfile bs=1M count=1024 conv=fdatasync
Show running containers namespaces
lsns -t net,pid,mnt
Inspect cgroup hierarchy
systemd-cgls
Count lines in all logs
find /var/log -name '*.log' -exec wc -l {} + | sort -rn | head -20
Follow multiple log files
tail -f /var/log/syslog /var/log/auth.log