k8s下服务做threaddump和heapdump操作过程

1. #查询节点的资源使用情况

kubectl -n kjhs-yonyou top nodes

2.#查询每个服务的资源使用情况

kubectl -n kjhs-yonyou top pod

3.#做theaddump和heapdump文件

#找一个内存使用最大的服务，进入容器中做dump文件

kubectl -n kjhs-yonyou exec -it f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd sh (f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd为服务节点名称）

 #进入容器之后先检查下是否有jstack和jmap命令，如果是oracle jdk就会有这两个命令；如果不存在就把jdk拷贝到容器中；

jstack -help

 jmap -help

#查看对应服务的java进程 

ps -ef|grep java

 #做threaddump文件操作，建议做3次

jstack 1 > /home/admin/app/f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd-threaddump-`date +%Y%m%d%H%M%S`.txt

 #做heapdump文件，建议正常情况做一次，发生full gc做一次

jmap -dump:format=b,file=/home/admin/app/f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd-heapdump-`date +%Y%m%d%H%M%S`.hprof 1

#压缩heapdump文件

gzip f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd-heapdump-20230524103142.hprof

4.#把上面做的四个文件拷贝出来（从容器中拷贝到master服务器中）

kubectl cp -n -kjhs-yonyou f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd:/home/admin/app/f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd-heapdump-20230524103142.hprof.gz /root/f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd-heapdump-20230524103142.hprof.gz

kubectl cp -n -kjhs-yonyou f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd:/home/admin/app/f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd-threaddump-20230524102618.txt /root/f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd-threaddump-20230524102618.txt

kubectl cp -n -kjhs-yonyou f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd:/home/admin/app/f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd-threaddump-20230524102638.txt /root/f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd-threaddump-20230524102638.txt

kubectl cp -n -kjhs-yonyou f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd:/home/admin/app/f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd-threaddump-20230524102650.txt /root/f9667046-kjhs-yonyou-agla-cwy2-blue-b455b8d56-gs6hd-threaddump-20230524102650.txt

5.#对这四个文件进行分析