日常环境莫名宕机的处理

小灰灰 2022-03-11 13:29 234阅读 0赞

## 背景 ##

11.21 早上 pd 给讲法务评审的时候，操作日常环境，莫名就 down 机了，而且 pd 反馈经常会这样。（ps : pd 反馈系统请求时间过长，性能很差，后续也会排查解决）  
于是排查了一下系统 down 机的原因

## 原因 ##

查看内存 setenv.sh 设置  
if \[ ![006D.png_V_2.7.2][]![0065.png_V_2.7.2][]![006D.png_V_2.7.2][]![0054.png_V_2.7.2][]![006F.png_V_2.7.2][]![0074.png_V_2.7.2][]![0061.png_V_2.7.2][]![006C.png_V_2.7.2][]![2212.png_V_2.7.2][]![006C.png_V_2.7.2][]![0065.png_V_2.7.2][]![0032.png_V_2.7.2][]![0030.png_V_2.7.2][]![0034.png_V_2.7.2][]![0038.png_V_2.7.2][]![005D.png_V_2.7.2][]![003B.png_V_2.7.2][]![0074.png_V_2.7.2][]![0068.png_V_2.7.2][]![0065.png_V_2.7.2][]![006E.png_V_2.7.2][]![0053.png_V_2.7.2][]![0045.png_V_2.7.2][]![0052.png_V_2.7.2][]![0056.png_V_2.7.2][]![0049.png_V_2.7.2][]![0043.png_V_2.7.2][]![0045.png_V_2.7.2][]![004F.png_V_2.7.2][]![0050.png_V_2.7.2][]![0054.png_V_2.7.2][]![0053.png_V_2.7.2][]![003D.png_V_2.7.2][]![0022.png_V_2.7.2][]memTotal−le2048\];thenSERVICEOPTS="\{SERVICE\_OPTS\} -Xms1536m -Xmx1536m"  
SERVICE\_OPTS="![0053.png_V_2.7.2][]![0045.png_V_2.7.2][]![0052.png_V_2.7.2][]![0056.png_V_2.7.2][]![0049.png_V_2.7.2][]![0043.png_V_2.7.2][]![0045.png_V_2.7.2][]![004F.png_V_2.7.2][]![0050.png_V_2.7.2][]![0054.png_V_2.7.2][]![0053.png_V_2.7.2][]![2212.png_V_2.7.2][]![0058.png_V_2.7.2][]![006D.png_V_2.7.2][]![006E.png_V_2.7.2][]![0037.png_V_2.7.2][]![0036.png_V_2.7.2][]![0038.png_V_2.7.2][]![006D.png_V_2.7.2][]![0022.png_V_2.7.2][]![0065.png_V_2.7.2][]![006C.png_V_2.7.2][]![0073.png_V_2.7.2][]![0065.png_V_2.7.2][]![0053.png_V_2.7.2][]![0045.png_V_2.7.2][]![0052.png_V_2.7.2][]![0056.png_V_2.7.2][]![0049.png_V_2.7.2][]![0043.png_V_2.7.2][]![0045.png_V_2.7.2][]![004F.png_V_2.7.2][]![0050.png_V_2.7.2][]![0054.png_V_2.7.2][]![0053.png_V_2.7.2][]![003D.png_V_2.7.2][]![0022.png_V_2.7.2][]SERVICEOPTS−Xmn768m"elseSERVICEOPTS="\{SERVICE\_OPTS\} -Xms4g -Xmx4g"  
SERVICE\_OPTS="$\{SERVICE\_OPTS\} -Xmn2g"  
fi

查看日常机器内存  
$cat /proc/meminfo | grep MemTotal  
MemTotal: 4194304 kB  
![image.png][]

看出问题了吧，我们设置的最大内存是4G，而我们的linux 机器是不会把4G 内存全部分配给应用的。应用在运行过程中，一直会消耗内存，当快达到4G 的时候，应用认为还有可用内存，并不一定会及时 GC。导致内存不足，内存被撑满了，我们的应用也就 down 机了

## 处理方法 ##

### 两种方法： ###

1. 设置jvm 参数为自适应

2. 申请8G 机器

这里我选择方法一

1.拉取新的分支，修改 setenv.sh

Plain Text

# if os memory <= 4G
    if [ $memTotal -le 4195 ]; then
      SERVICE_OPTS="${SERVICE_OPTS} -Xms3536m -Xmx3536m"
      SERVICE_OPTS="${SERVICE_OPTS} -Xmn1536m"
    else
      SERVICE_OPTS="${SERVICE_OPTS} -Xms4g -Xmx4g"
      SERVICE_OPTS="${SERVICE_OPTS} -Xmn2g"
    fi

这里根据我们的环境设置，因为日常其实是4G，线上机器是8G，所以修改只会修改日常环境。

[原文链接][Link 1]

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[Link 1]: https://yq.aliyun.com/articles/692755?spm=a2c4e.11157919.spm-cont-list.19.79e527ae0SzviD