Linux monitor resources from terminal

Resources

Saidar

sudo apt-get install saidar

Hostname  : linux-ubuntu  Uptime : 00:14:52          Date : 2015-01-25 11:56:42

Load 1    :   0.19   CPU Idle  :  96.01%  Running   :     2   Zombie    :     0
Load 5    :   0.27   CPU System:   1.12%  Sleeping  :   198   Total     :   200
Load 15   :   0.22   CPU User  :   2.87%  Stopped   :     0   No. Users :     2 

Mem Total :   3729M  Swap Total:   3869M  Mem Used  : 22.04%  Paging in :     0
Mem Used  :    822M  Swap Used :      0B  Swap Used :  0.00%  Paging out:     0
Mem Free  :   2907M  Swap Free :   3869M  Total Used: 10.82%

Disk Name      Read         Write         Network Interface        rx        tx
ram0             0B            0B         eth0                     0B        0B
ram1             0B            0B         lo                       0B        0B
ram2             0B            0B         wlan0                  373B       84B
ram3             0B            0B
ram4             0B            0B         Mount Point            Free      Used
ram5             0B            0B         /                      245G     10.59%
ram6             0B            0B         /sys                     0B      -nan%
ram7             0B            0B         /proc                    0B      -nan%
ram8             0B            0B         /dev                  1854M      0.00%
ram9             0B            0B         /dev/pts                 0B      -nan%
ram10            0B            0B         /run                   371M      0.34%
ram11            0B            0B         /                      245G     10.59%
ram12            0B            0Bram13    /sys/fs/cgroup4       4096B0Bra  0.00

Network

netstat - network statistics

In CentOS 7 net-tools package has been replaced by iproute2 therefore in course to use netstat needs installing:

[piotr@vmcent7 ~]$ sudo yum install net-tools

[piotr@vmcent7 ~]$ sudo netstat -pant
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      1771/master         
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1434/sshd           
tcp        0      0 192.168.1.148:22        192.168.1.89:40653      ESTABLISHED 35910/sshd: piotr [ 
tcp        0      0 192.168.1.148:22        192.168.1.89:40614      ESTABLISHED 35831/sshd: piotr [ 
tcp        0      0 192.168.1.148:22        192.168.1.64:4334       ESTABLISHED 35679/sshd: piotr [ 
tcp6       0      0 ::1:25                  :::*                    LISTEN      1771/master         
tcp6       0      0 :::22                   :::*                    LISTEN      1434/sshd           

ss - socket viewer

ss tool is by defult shipped in a minimal CentOS 7, similar to the netstat provides more detailed information about sockets.

[piotr@vmcent7 ~]$ sudo ss -pant
State       Recv-Q Send-Q             Local Address:Port          Peer Address:Port 
LISTEN      0      100                    127.0.0.1:25                       *:*      users:(("master",1771,13))
LISTEN      0      128                            *:22                       *:*      users:(("sshd",1434,3))
ESTAB       0      0                  192.168.1.148:22            192.168.1.89:40653  users:(("sshd",35914,3),("sshd",35910,3))
ESTAB       0      0                  192.168.1.148:22            192.168.1.89:40614  users:(("sshd",35835,3),("sshd",35831,3))
ESTAB       0      0                  192.168.1.148:22            192.168.1.64:4334   users:(("sshd",35683,3),("sshd",35679,3))
LISTEN      0      100                          ::1:25                      :::*      users:(("master",1771,14))
LISTEN      0      128                           :::22                      :::*      users:(("sshd",1434,4))

Other performance monitoring tools

• iftraf
• iftop
• htop
• lsof
• iotop

Service control managers

• Ubuntu: System > Administrator > services
• bum - GUI bootup manager
• rcconf
• sysv-rc-conft

References

• Command line tools to monitor Linux performance Tecmint