Cheatography
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A brief review of the commands found in the book DevOps Troubleshooting.
System Load
uptime |
5; 10; 15 minute CPU load average |
top -b -n 1 |
(b)atch mode; (n)times to update before closing |
systat pkg |
/etc/default/sysstat 'ENABLED="true"' |
iotop |
top, but for disk usage |
iostat |
shows I/O stats for blk devices. |
sar |
view sysstat logs for the day |
sar (-r) (-b) |
-r View ram statistic ; -b view I/O statistics |
sar -s 00:00:00 -e 00:00:00 |
view stats within range date (s)tart to (e)nd |
sar -f /var/log/sysstat/sa** |
from full path |
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Disk Management
e2label /dev/sd* / |
Change the label on a ext* filesystem |
blkid |
locate/print block device attributes |
/etc/fstab |
file systems mounted at boot. |
du -ckx | sort -n |
Disk Usage (c)Total (k)1k Blk Size (x) one file system. sort by number |
/etc/logrotate.conf |
edit logrotate settings |
df -i |
report disk space usage, (i) inodes |
fsck -y -C /dev/sda* |
file system check (y) yes (C) progress bar |
mke2fs -n /dev/sda* |
list superblocks on a file system. |
fsck -b (superblock) -y -C /dev/sda* |
run fsck and repair superblock with backup |
Networking Troubleshooting
ifconfig |
gather information about network adapters |
ethtool eth0 |
tool to analyze Ethernet connection. |
sudo route -n |
check routing table, (n)o dns resolution |
sudo service networking restart |
restart networking service |
nslookup |
query dns for URL/IP |
traceroute |
traces route to host |
nmap -p $port $ipaddr |
check (p)ort range with $ipaddr |
sudo netstat -lnp |
show only (l)istening sockets (n)umeric (p)program, shows PID and name of program |
iptables -L |
Show all firewall rules |
iftop |
top for open network connections |
tcpdump -n |
packet dump |
tcpdump (not) host/port |
filter options for tcpdump |
sudo tcpdump -C 10 -n -l host website | tee outputfile |
run tcpdump and output to file, -C sets max size of output file |
dig website |
like nslookup, more informative. |
dig target @dns |
check dns record of target against specific dns |
dig target +trace |
traces DNS route |
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