[20200224]观察使用TCP keep-alive feature特性.txt

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[20200224]观察使用TCP keep-alive feature特性.txt --//前几天测试，提到观察使用TCP keep-alive feature特性，可以执行netsta -npo | grep <进程号>确定，这是一种简单快捷的方式。 --//实际上可以ss -nop观察可以获得一样的效果. 1.环境： --//服务端设置： SCOTT@book> @ ver1 PORT_STRING VERSION BANNER ------------------------------ -------------- -------------------------------------------------------------------------------- x86_64/Linux 2.4.xx 11.2.0.4.0 Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production # echo /proc/sys/net/ipv4/tcp_keepalive* | xargs -n 1 strings -1 -f /proc/sys/net/ipv4/tcp_keepalive_intvl: 75 /proc/sys/net/ipv4/tcp_keepalive_probes: 9 /proc/sys/net/ipv4/tcp_keepalive_time: 7200 $ grep SQLNET.EXPIRE_TIME $ORACLE_HOME/network/admin/sqlnet.ora #SQLNET.EXPIRE_TIME = 1 2.测试: # netstat -ntop 2>/dev/null Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name Timer tcp 0 0 192.168.100.78:59597 192.168.100.78:1521 ESTABLISHED 52283/ora_pmon_book off (0.00/0/0) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ tcp 0 0 192.168.100.78:22 192.168.98.6:58436 ESTABLISHED 52769/sshd keepalive (3359.89/0/0) tcp 0 0 192.168.100.78:22 192.168.98.6:51182 ESTABLISHED 51346/sshd keepalive (2884.83/0/0) tcp 0 0 192.168.100.78:33066 192.168.xx.xxx:1521 ESTABLISHED 53413/sqlplus off (0.00/0/0) tcp 0 0 192.168.100.78:1521 192.168.100.78:59597 ESTABLISHED 52834/tnslsnr keepalive (3507.32/0/0) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ --//sqlplus 进程没有使用 ENABLE=BROKEN连接,可以发现它的keepalive timer状态是off. --//有点奇怪的是ora_pmon_book进程也是off,我已经重启监听的情况下再启动数据库的情况下也是一样. --//自己还有一个疑问,如果不起监听进程,ora_pmon_book看到是什么情况呢? --//注意看下划线内容,ora_pmon_book进程与tnslsnr进程的网络连接是配对的.留在以后测试. --//实际上还可以使用ss -ntop命令。 # ss -ntop| expand State Recv-Q Send-Q Local Address:Port Peer Address:Port ESTAB 0 0 192.168.100.78:59597 192.168.100.78:1521 users:(("oracle",52283,10)) ESTAB 0 0 192.168.100.78:22 192.168.98.6:58436 timer:(keepalive,54min,0) users:(("sshd",52769,3)) ESTAB 0 0 192.168.100.78:22 192.168.98.6:51182 timer:(keepalive,47min,0) users:(("sshd",51346,3)) ESTAB 0 0 192.168.100.78:33066 192.168.xx.xxx:1521 users:(("sqlplus",53413,7)) ESTAB 0 0 192.168.100.78:1521 192.168.100.78:59597 timer:(keepalive,57min,0) users:(("tnslsnr",52834,12)) --//ss -ntop显示如果时间很大,显示的单位是min.后面users还记录的很多信息,第1个参数是进程名,第2个参数是进程号,第3个参数是 --//socket对应的文件句柄. --//修改如下： # echo /proc/sys/net/ipv4/tcp_keepalive* | xargs -n 1 strings -1 -f /proc/sys/net/ipv4/tcp_keepalive_intvl: 10 /proc/sys/net/ipv4/tcp_keepalive_probes: 4 /proc/sys/net/ipv4/tcp_keepalive_time: 33 SCOTT@78> @ spid SID SERIAL# PROCESS SERVER SPID PID P_SERIAL# C50 --- ------- --------- --------- ----- --- ---------- ------------------------------------------- 1 99 4328:3512 DEDICATED 53495 24 33 alter system kill session '1,99' immediate; # seq 40 | xargs -IQ bash -c "ss -ntop | expand | grep 53495;sleep 1" ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,614ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,9.569ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,8.508ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,7.449ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,6.388ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,5.329ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,4.268ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,3.209ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,2.149ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,1.090ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,028ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,21sec,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,20sec,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,19sec,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,18sec,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,17sec,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,16sec,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,15sec,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,14sec,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,13sec,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,12sec,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,11sec,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,10sec,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,9.249ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,8.188ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,7.129ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,6.068ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,5.009ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,3.948ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,2.887ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,1.828ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,767ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,9.724ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,8.664ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,7.604ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,6.543ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,5.484ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,4.425ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,3.362ms,0) users:(("oracle",53495,13)) ESTAB 0 0 192.168.100.78:1521 192.168.98.6:61642 timer:(keepalive,2.302ms,0) users:(("oracle",53495,13)) --//看到的与netstat看到一样,你可以发现keepalive分成2部分,1部分10秒,1部分23秒?. --//使用netstat看到的情况如下. # seq 40 | xargs -IQ bash -c "netstat -nop | grep 53495;sleep 1" tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (1.72/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (0.69/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (9.68/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (8.66/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (7.63/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (6.61/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (5.58/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (4.56/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (3.53/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (2.51/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (1.48/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (0.46/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (22.44/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (21.42/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (20.39/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (19.37/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (18.34/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (17.32/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (16.29/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (15.27/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (14.24/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (13.22/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (12.20/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (11.17/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (10.15/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (9.12/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (8.10/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (7.07/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (6.05/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (5.03/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (4.00/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (2.98/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (1.95/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (0.93/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (9.92/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (8.89/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (7.87/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (6.84/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (5.82/0/0) tcp 0 0 192.168.100.78:1521 192.168.98.6:61642 ESTABLISHED 53495/oraclebook keepalive (4.80/0/0) --//windows下有什么工具或者命令行观察keealive timer呢?那位知道...

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[20200224]观察使用TCP keep-alive feature特性.txt

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