排查线上环境内存溢出(OOM)

本文主要是介绍排查线上环境内存溢出(OOM)，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1、先使用命令列出所有已运行的容器

docker ps

[root@dasdadsd ~]# docker ps
CONTAINER ID   IMAGE        COMMAND                  CREATED        STATUS        PORTS                                       NAMES
71c935097187   redis:6.0    "docker-entrypoint.s…"   8 weeks ago    Up 8 weeks    0.0.0.0:5655->6379/tcp, :::5122->6379/tcp   redis
c321a5c56eab   smessage:1   "/bin/sh -c 'java -j…"   2 months ago   Up 2 months   0.0.0.0:4545->4565/tcp, :::5123->3123/tcp   smessage

2、找到容器进入

docker exec -it [容器id] /bin/bash

[root@dasdadsd ~]# docker exec -it c32 /bin/bash
root@c321a5c56eab:/# 

3、我这里使用的是top指令查看

root@dasdadsd :/# top

top - 13:02:50 up 86 days,  4:20,  0 users,  load average: 0.05, 0.05, 0.01
Tasks:  13 total,   1 running,  12 sleeping,   0 stopped,   0 zombie
%Cpu(s):  1.0 us,  0.7 sy,  0.0 ni, 98.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem:   1995464 total,  1617408 used,   378056 free,   116708 buffers
KiB Swap:  1049596 total,   273408 used,   776188 free.   388496 cached MemPID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND                                                                                      7 root      20   0 2528792 384840   4076 S  0.3 19.3 124:35.79 java                                                                                         1 root      20   0    4336     88      0 S  0.0  0.0   0:00.02 sh                                                                                           1102 root      20   0   21960    760    252 S  0.0  0.0   0:00.02 bash                                                                                         8014 root      20   0   21960    788    280 S  0.0  0.0   0:00.03 bash                                                                                         8584 root      20   0   21960    760    256 S  0.0  0.0   0:00.02 bash                                                                                         
10153 root      20   0   21960   3504   2996 S  0.0  0.2   0:00.03 bash                                                                                         
10175 root      20   0   23636   2656   2288 R  0.0  0.1   0:00.00 top                                                                                          
11097 root      20   0   21956    756    252 S  0.0  0.0   0:00.03 bash                                                                                         
15019 root      20   0   21956    772    264 S  0.0  0.0   0:00.04 bash                                                                                         
24749 root      20   0   21960    768    264 S  0.0  0.0   0:00.03 bash                                                                                         
30518 root      20   0   21960    788    280 S  0.0  0.0   0:00.02 bash                                                                                         
31525 root      20   0   21960    760    252 S  0.0  0.0   0:00.02 bash                                                                                         
32165 root      20   0   21960    776    268 S  0.0  0.0   0:00.02 bash    

找到java的pid为7

4、使用 下面的命令进行分析 

jmap -histo [java进程号] | head -[展示行数]

root@c321a5c56eab:/# jmap -histo 7|head -20num     #instances         #bytes  class name
----------------------------------------------1:         38723       53068200  [B2:        165183       41040304  [C3:          6379       22771536  [I4:        467926       14973632  java.util.HashMap$Node5:        203504        6512128  com.mysql.cj.conf.BooleanProperty6:         15270        5198864  [Ljava.util.HashMap$Node;7:        114471        3663072  com.mysql.cj.conf.StringProperty8:        151533        3636792  java.lang.String9:         72718        2908720  java.util.TreeMap$Entry10:         56327        1802464  com.mysql.cj.conf.IntegerProperty11:         26419        1200112  [Ljava.lang.Object;12:         22626        1086048  java.util.HashMap13:          9319        1030968  java.lang.Class14:         31635        1012320  java.util.concurrent.ConcurrentHashMap$Node15:          9791         861608  java.lang.reflect.Method16:         39255         628080  java.lang.Object17:         16936         541952  java.util.Hashtable$Entry

这就看出来每个类栈的内存了

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