Benchmark sequential disk IO linux
Write 1GB with forced sync to measure raw write speed
dd if=/dev/zero of=/tmp/testfile bs=1M count=1024 conv=fdatasync
more linux
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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
Search compressed logs
zgrep -i 'error' /var/log/syslog.*.gz