View CPU, Memory, I/O and NetFlow

View disk I/O with iostat
 
[Root @ localhost ~] # Iostat-d-x 2
Extended device statistics
Device mgr/s mgw/s r/s w/s kr/s kw/s size queue wait svc_t % B
Hda 0 0 0.0 0.9 0.1 5.4 6.3 0.0 4.7 0.9 0
Extended device statistics
Device mgr/s mgw/s r/s w/s kr/s kw/s size queue wait svc_t % B
Hda 0 3 0.0 2.0 0.0 20.0 10.0 0.0 0.8 0.5 0
......
 
Command Description: view disk I/0, and refresh every two seconds
 
[Root @ localhost ~] # Vmstat 5
Procs ----------- memory ---------- --- swap -- ----- io ---- system -- ----- cpu ------
R B swpd free buff cache si so bi bo in cs us sy id wa st
0 0 284 68700 165876 0 0 0 5 1 1 0 0 416748 0
......
 
Command Description: Command Used to view CPU usage, which is refreshed every 5 seconds. the rightmost column is the CPU usage data.
Top view process shares
 
[Root @ localhost ~] # Top
 
Then, Enter shift + p or P in the command bar of the top command.
 
Top-13:38:52 up 102 days, 1 user, load average: 0.00, 0.00, 0.00
Tasks: 81 total, 2 running, 79 sleeping, 0 stopped, 0 zombie
Cpu (s): 0.0% us, 0.0% sy, 0.0% ni, 100.0% id, 0.0% wa, 0.0% hi, 0.0% si, 0.0% st
Mem: 1035292 k total, 966592 k used, 68700 k free, 165876 k buffers
Swap: 2096472 k total, 284 k used, 2096188 k free, 416760 k cached
 
Pid user pr ni virt res shr s % CPU % mem time + COMMAND
4875 root 15 0 2192 1000 R 800 0.3. 15 top
1 root 15 0 2060 620 S 532 0.0. 65 init
2 root RT-5 0 0 S 0.0 0.0. 00 migration/0
.......
 
Command Description: View and sort the CPU usage of a process.
Free view memory usage
 
[Root @ localhost ~] # Free
Total used free shared buffers cached
Mem: 1035292 966592 68700 0 165876 416768
-/+ Buffers/cache: 383948 651344
Swap: 2096472 284 2096188
 
Command Description: view memory usage
Top view process memory usage
 
[Root @ localhost ~] # Top
 
Then, Enter shift + m or M in the top command bar.
 
Top-13:48:52 up 102 days, 1 user, load average: 0.00, 0.01, 0.00
Tasks: 81 total, 2 running, 79 sleeping, 0 stopped, 0 zombie
Cpu (s): 0.0% us, 0.3% sy, 0.0% ni, 99.7% id, 0.0% wa, 0.0% hi, 0.0% si, 0.0% st
Mem: 1035292 k total, 966592 k used, 68700 k free, 165876 k buffers
Swap: 2096472 k total, 284 k used, 2096188 k free, 416784 k cached
 
Pid user pr ni virt res shr s % CPU % mem time + COMMAND
4128 root 34 19 280 m 266 m 2112 S 0.0. 40 yum-updatesd
8314 www 18 0 171 m 34 m 34 m S 0.0 0: 06. 03 memcacheq
8280 www 15 0 88084 34 m 588 S 0.0 0: 01. 23 memcached
10907 mysql 15 0 122 m 16 m 3892 S 0.0 0: 25. 29 mysqld
......
 
Command Description: view the memory usage of the process and sort it.
Obtain network traffic for an Interface
 
[Root @ localhost ~] # Date; ifconfig eth0
Sun Mar 13 13:51:29 CST 2011
Eth0 Link encap: Ethernet HWaddr 00: 50: 56: A4: 0D: 89
Inet addr: 172.10.7.215 Bcast: 172.10.7.255 Mask: 255.255.248.0
Inet6 addr: fe80 :: 250: 56ff: fea4: d89/64 Scope: Link
Up broadcast running multicast mtu: 1500 Metric: 1
RX packets: 72113071 errors: 12213 dropped: 30790 overruns: 0 frame: 0
TX packets: 1062902 errors: 0 dropped: 0 overruns: 0 carrier: 0
Collisions: 0 FIG: 1000
RX bytes: 3311165612 (3.0 GiB) TX bytes: 101244262 (96.5 MiB)
Interrupt: 59 Base address: 0x2000
 
[Root @ localhost ~] # Date; ifconfig eth0
Sun Mar 13 13:53:13 CST 2011
Eth0 Link encap: Ethernet HWaddr 00: 50: 56: A4: 0D: 89
Inet addr: 172.10.7.215 Bcast: 172.10.7.255 Mask: 255.255.248.0
Inet6 addr: fe80 :: 250: 56ff: fea4: d89/64 Scope: Link
Up broadcast running multicast mtu: 1500 Metric: 1
RX packets: 72113528 errors: 12213 dropped: 30790 overruns: 0 frame: 0
TX packets: 1062968 errors: 0 dropped: 0 overruns: 0 carrier: 0
Collisions: 0 FIG: 1000
RX bytes: 3311204659 (3.0 GiB) TX bytes: 101285190 (96.5 MiB)
Interrupt: 59 Base address: 0x2000
 
Command Description: Obtain the network traffic for an Interface by comparing the RX and TX data of two time network interfaces.

Author: ERDP Technical Architecture"