Cheatography
https://cheatography.com
A brief review of the commands found in the book DevOps Troubleshooting.
System Loaduptime | 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 |
| | Disk Managemente2label /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 Troubleshootingifconfig | 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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