Per-process block I/O top troubleshooting
bcc biotop: which pid drives block I/O by bytes/latency; modern: bpftrace one-liners
biotop-bpfcc -C 5 1
more troubleshooting
all 32 commands →
Conntrack table full check
conntrack -L 2>/dev/null | wc -l; conntrack -S
Conntrack live events
conntrack -E -p tcp --dport 443 -o timestamp
Ephemeral port exhaustion
ss -tan state time-wait | wc -l; sysctl net.ipv4.ip_local_port_range
Socket summary stats
ss -s; ss -tan state syn-sent | wc -l
Path MTU discovery
tracepath -n <host>; ping -M do -s 1472 -c2 <host>