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