linux日常管理1
# w17:52:51 up 2 days,1:23,1 user,load average: 0.00, 0.00, 0.00
时间 运行了几天几小时 几个用户 1分钟负载5分钟负载15分钟负载
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root pts/0 192.168.100.5 17:50 1.00s0.86s0.67s w
负载的解释1/5/15分钟之内有几个进程使用CPU
# uptime
18:08:00 up 2 days,1:38,1 user,load average: 0.00, 0.00, 0.00
# cat /proc/cpuinfo
processor: 0
vendor_id: GenuineIntel
cpu family: 6
model: 42
model name: Intel(R) Core(TM) i5-2450M CPU @ 2.50GHz
stepping: 7
cpu MHz: 2494.389
cache size: 3072 KB
fdiv_bug: no
hlt_bug: no
f00f_bug: no
coma_bug: no
fpu: yes
top
top -bn1静态显示
# vmstat
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----
交换中空闲写入磁盘 缓存
运行阻塞 缓冲区
rb swpd free buffcache si so bi bo in cs us sy id wa st
00 0 108040 119152 682536 0 0 4 4 13 1300 10000
vmstat 1每隔一秒显示一次
vmstat 1 10 每隔一秒显示一次，总共显示10次
iotop
# iotop
Total DISK READ: 0.00 B/s | Total DISK WRITE: 0.00 B/s
TIDPRIOUSER DISK READDISK WRITESWAPIN IO> COMMAND
1 be/4 root 0.00 B/s 0.00 B/s0.00 %0.00 % init
2 be/4 root 0.00 B/s 0.00 B/s0.00 %0.00 %
3 rt/4 root 0.00 B/s 0.00 B/s0.00 %0.00 %
4 be/4 root 0.00 B/s 0.00 B/s0.00 %0.00 %
5 rt/4 root 0.00 B/s 0.00 B/s0.00 %0.00 %
6 rt/4 root 0.00 B/s 0.00 B/s0.00 %0.00 %
7 be/4 root 0.00 B/s 0.00 B/s0.00 %0.00 %
8 be/4 root 0.00 B/s 0.00 B/s0.00 %0.00 %
9 be/4 root 0.00 B/s 0.00 B/s0.00 %0.00 %
iostat
# iostat
Linux 2.6.32-431.el6.i686 (bogon) 2017年01月05日 _i686_(1 CPU)
avg-cpu:%user %nice %system %iowait%steal %idle
0.03 0.02 0.11 0.17 0.00 99.67
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 0.41 8.35 8.57 1527132 1567892
scd0 0.00 0.00 0.00 400 0
sar -n DEV 1 10显示10次网卡流量
sar -b 1 10 查看磁盘IO
sar -q -f /var/log/sa/sa04 查看4号的日志
ps -eo pid,grgs,psr查看哪个进程运行在哪个CPU上
netstat -lnp系统开放哪些端口
netstat -an 查看网络连接状态
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