Usefull linux tools
please note: for installing some toosl you ned to connect EPEL repo ( http://wiki.vpsget.com/index.php/Epel_centos) first.
htop -extened version of top (process list, memory use ,etc..)
atop - Advanced top. The most powerfull monitoring tool (CPU, IO, MEM, SWP, Commited, Network, Caches, etc)
iotop - Show top I/O disk usage processes.
dnstop - show dns connections . Example using from CT: dnstop -4 venet0
stress - H/W stress test [Example: stress --cpu 8 --io 16 --vm 32 --vm-bytes 256M --timeout 100000000s]
vmstat - system activity, hardware and system information
ps - displays the processes (ps aux for e.g)
free - memory usage
iostat - average CPU load, disk activity
mpstat - multiprocessor usage
pmap - process memory usage
netstat and ss - network statistics
iftop - showing n/w interfaces traffic usage
iptraf - real-time network statistics
tcpdump - detailed network traffic analysis
strace - system calls
cpuburn - cpu stress test
dd if=/dev/zero of=/dev/null - load 1 CPU core
Use next to make more CPU cores load:
fulload() { dd if=/dev/zero of=/dev/null | dd if=/dev/zero of=/dev/null | dd if=/dev/zero of=/dev/null | dd if=/dev/zero of=/dev/null & }; fulload; read; killall dd
df -h - show hdd usage statistics
lsof - list open files, network connections and much more. Example: lsof -i:80 - show pids that using port 80.
nmap - scan specified host for open ports.
vnstat - vnStat is a console-based network traffic monitor
scp - copying data from one linux host to another using ssh
mtr - combines the functionality of the traceroute and ping programs in a single network diagnostic tool.
smartctl - show/test smart on the specified HDD (Examples: smartctl -a /dev/sda; smartctl -a /dev/sda; smartctl -H /dev/sda. Test : smartctl --test=short /dev/sda; smartctl --test=long /dev/sda)
smartctl and megaraid - use smartctl with megaraid tool will show the SMART status for HDDs in RAID. [Example: smartctl -a -d megaraid,5 /dev/sda]
w -will show logged users (tty)
uname -a - show linux version with kernel details
cat /etc/issue - will show the linux distro
whoami - use this command after the gr8 party:)
pkill -KILL -u {username} - log out user
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