Linux命令学习1203

更新yum源

cd /ect/yum.repos.d/CentOS-Base.repo
mv  /etc/yum.repos.d/CentOS-Base.repo  /etc/yum.repos.d/CentOS-Base.repo.backup

wget -O  /etc/yum.repos.d/CentOS-Base.repo  http://mirrors.aliyun.com/repo/Centos-7.repo

yum makecache

yum -y update

Linux系统监控命令

  1. top命令

    top - 14:10:24 up 83 days, 22:45,  1 user,  load average: 0.00, 0.03, 0.05
    Tasks: 105 total,   1 running, 104 sleeping,   0 stopped,   0 zombie
    %Cpu(s):  0.0 us,  3.1 sy,  0.0 ni, 96.9 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
    KiB Mem :  1014856 total,   115416 free,   508424 used,   391016 buff/cache
    KiB Swap:        0 total,        0 free,        0 used.   358212 avail Mem
    
    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
    1882 root      20   0  159940   2096   1472 R   6.2  0.2   0:00.01 top
    1 root      20   0  128196   5360   2732 S   0.0  0.5  10:39.84 systemd
    2 root      20   0       0      0      0 S   0.0  0.0   0:01.59 kthreadd
    3 root      20   0       0      0      0 S   0.0  0.0   0:06.67 ksoftirqd/0
    5 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/0:0H
    7 root      rt   0       0      0      0 S   0.0  0.0   0:12.07 migration/0
    8 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcu_bh
    9 root      20   0       0      0      0 S   0.0  0.0   2:12.40 rcu_sched
    10 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 lru-add-drain
    11 root      rt   0       0      0      0 S   0.0  0.0   0:28.64 watchdog/0
    12 root      rt   0       0      0      0 S   0.0  0.0   0:21.85 watchdog/1
    13 root      rt   0       0      0      0 S   0.0  0.0   0:11.15 migration/1
    14 root      20   0       0      0      0 S   0.0  0.0   0:05.78 ksoftirqd/1
    16 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/1:0H
    18 root      20   0       0      0      0 S   0.0  0.0   0:00.00 kdevtmpfs
    19 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 netns
    20 root      20   0       0      0      0 S   0.0  0.0   0:02.45 khungtaskd
    21 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 writeback
    22 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kintegrityd
    23 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 bioset
    24 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 bioset
    25 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 bioset
    26 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kblockd
    27 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 md
    28 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 edac-poller
    29 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 watchdogd
    36 root      20   0       0      0      0 S   0.0  0.0   1:32.96 kswapd0
    37 root      25   5       0      0      0 S   0.0  0.0   0:00.00 ksmd
    

参数: M,t

  1. vmstat命令

    [root@instance-1 openvpn]# vmstat 2 10
    procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
    r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
    1  0      0 267344      0 256004    0    0     9     4    2    0  0  0 100  0  0
    0  0      0 267344      0 256024    0    0     0     0  193  274  0  0 100  0  0
    
    

参数解释:2表示间隔时间,10表示次数