free 內(nèi)存使用
free -m
total used free shared buffers cached
Mem: 64407 61313 3094 0 550 55163
-/+ buffers/cache: 5599 58807
Swap: 0 0 0
顯示可用內(nèi)存58807M,總內(nèi)存64407M
top 看負(fù)載
主要看 load average和是否有些不明進(jìn)程在運(yùn)行祥得，用pidstat查看對應(yīng)進(jìn)程的資源使用情況
pidstat查看某進(jìn)程使用內(nèi)存、cpu钮呀、disk情況
查看5861進(jìn)程
pidstat -r -p 5861 3
08:41:08 AM PID minflt/s majflt/s VSZ RSS %MEM Command
08:41:11 AM 5861 1.00 0.00 664944 216948 0.33 pusher
08:41:14 AM 5861 1.00 0.00 664944 216948 0.33 pusher
08:41:17 AM 5861 1.00 0.00 664944 216948 0.33 pusher
08:41:20 AM 5861 1.00 0.00 664944 216948 0.33 pusher
08:41:23 AM 5861 1.00 0.00 664944 216948 0.33 pusher
08:41:26 AM 5861 1.00 0.00 664944 216948 0.33 pusher
pidstat -u -p 5861 3
08:43:46 AM PID %usr %system %guest %CPU CPU Command
08:43:49 AM 5861 2.00 2.67 0.00 4.67 8 pusher
08:43:52 AM 5861 1.67 3.00 0.00 4.67 8 pusher
pidstat -d -p 5861 3
08:44:48 AM PID kB_rd/s kB_wr/s kB_ccwr/s Command
08:44:51 AM 5861 0.00 0.00 0.00 pusher
08:44:54 AM 5861 0.00 6.67 0.00 pusher
08:44:57 AM 5861 0.00 0.00 0.00 pusher
08:45:00 AM 5861 0.00 0.00 0.00 pusher
08:45:03 AM 5861 0.00 0.00 0.00 pusher
ps 和 grep 通過進(jìn)程名查看進(jìn)程
如查看nginxps aux | grep nginx
23131 18314 0.0 0.0 24084 2288 ? S Jul06 7:40 nginx: worker process
23131 18315 0.0 0.0 24084 2128 ? S Jul06 7:52 nginx: worker process
23131 18316 0.0 0.0 24084 2284 ? S Jul06 0:47 nginx: worker process
23131 18317 0.0 0.0 24084 2288 ? S Jul06 7:22 nginx: worker process
23131 18318 0.0 0.0 24084 2292 ? S Jul06 7:26 nginx: worker process
23131 18319 0.0 0.0 24084 2292 ? S Jul06 6:39 nginx: worker process
netatat 查看端口號
netstat -ant | grep 8099
tcp 0 0 0.0.0.0:8099 0.0.0.0:* LISTEN
tcp 0 0 10.99.23.15:8777 172.22.146.63:58099 ESTABLISHED
ping看主機(jī)是否能通
ping baidu.com
PING baidu.com (180.149.132.47): 56 data bytes
64 bytes from 180.149.132.47: icmp_seq=0 ttl=52 time=5.500 ms
64 bytes from 180.149.132.47: icmp_seq=1 ttl=52 time=5.478 ms
telnet看主機(jī)某端口是否能通 忽孽，是否有防火墻不能訪問或者沒開通外網(wǎng)端口
telnet 10.99.23.15 8099
Trying 10.99.23.15...
Connected to cp01-rdqa-dev194.cp01.baidu.com.
Escape character is '^]'.
^]
df 查看磁盤使用情況
df -h
du 查看當(dāng)前目錄下文件和文件夾大小
du -sh *
516K controllers
4.0K favicon.ico
4.0K index.php
2.1M library
4.0K link.sh
lsof查看刪除的文件描述符還未釋放
lsof | grep deleted
kill 進(jìn)程
kill -9 pid
一般結(jié)合awk和xargs使用
ps aux | grep nginx | awk '{pirnt $2;}' | xargs kill -9
參考資料
1.http://www.infoq.com/cn/news/2015/12/linux-performance
2.http://www.cnblogs.com/ggjucheng/archive/2013/01/13/2858874.html
