在docker宿主機上查找指定容器內運行的所有進程的PID

找到指定容器的所有進程的PID可以更方便的對容器進程進行管理，特別是在某些容器卡住無法連接的場景。

1、找出容器ID

# docker ps

2、進入相應目錄

# cd /sys/fs/cgroup/memory/docker/d14e1a6182eeed7c8f2a7c0a315a790a16bfbab1fdc7a73813cdeee494e8050a/

3、進程號就存在一個文件里面

# cat cgroup.procs 1761 1869 1877 1892 1900 1903 3512 4793 4794

4、查看所有進程，找出對應的進程樹分支

# ps auxwwf ... root 1761 0.0 0.0 11360 2432 pts/13 Ss 06:40 0:00 \_ /bin/bash /root/bin/autoboot.sh root 1869 0.0 0.0 66744 2772 ? Ss 06:40 0:00 \_ /usr/sbin/sshd 497 1877 0.0 0.0 41396 2732 ? Ss 06:40 0:00 \_ /usr/sbin/nrpe -c /etc/nagios/nrpe.cfg -d root 1892 50.9 1.0 19031092 1068868 pts/13 Sl 06:40 143:06 \_ /usr/local/jdk/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -server -Xms2048m -Xmx2048m -XX:PermSize=256m -XX:MaxPermSize=256m -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/var/log/jvm/tomcat.dump -Xloggc:/var/log/jvm/tomcat_real.log -XX:+PrintGC -XX:+PrintGCDetails -XX:+PrintGCDateStamps -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/usr/local/tomcat/endorsed -classpath /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar -Dcatalina.base=/usr/local/tomcat -Dcatalina.home=/usr/local/tomcat -Djava.io.tmpdir=/usr/local/tomcat/temp org.apache.catalina.startup.Bootstrap start root 1900 0.0 0.0 20508 2304 ? Ss 06:40 0:00 \_ crond root 1903 0.0 0.0 11492 2688 pts/13 S+ 06:40 0:00 \_ /bin/bash root 3512 13.5 3.9 3922968 3892780 ? Ssl 06:46 37:15 \_ /usr/local/bin/redis-server *:6380 root 4793 0.0 0.0 109424 1880 ? Ss 06:47 0:00 \_ nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf 496 4794 0.0 0.0 109888 4516 ? S 06:47 0:00 \_ nginx: worker process ...

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還有一種更有效的獲取容器進程的方法，這種方法依賴docker程序，要是程序卡住就無法使用了。

docker top CONTAINERID

# docker top d14e1a6182eeed7c8f2a7c0a315a790a16bfbab1fdc7a73813cdeee494e8050a UID PID PPID C STIME TTY TIME CMD root 1761 4765 0 06:40 pts/13 00:00:00 /bin/bash /root/bin/autoboot.sh root 1869 1761 0 06:40 ? 00:00:00 /usr/sbin/sshd 497 1877 1761 0 06:40 ? 00:00:00 /usr/sbin/nrpe -c /etc/nagios/nrpe.cfg -d root 1892 1761 50 06:40 pts/13 02:33:35 /usr/local/jdk/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -server -Xms2048m -Xmx2048m -XX:PermSize=256m -XX:MaxPermSize=256m -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/var/log/jvm/tomcat.dump -Xloggc:/var/log/jvm/tomcat_real.log -XX:+PrintGC -XX:+PrintGCDetails -XX:+PrintGCDateStamps -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/usr/local/tomcat/endorsed -classpath /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar -Dcatalina.base=/usr/local/tomcat -Dcatalina.home=/usr/local/tomcat -Djava.io.tmpdir=/usr/local/tomcat/temp org.apache.catalina.startup.Bootstrap start root 1900 1761 0 06:40 ? 00:00:00 crond root 1903 1761 0 06:40 pts/13 00:00:00 /bin/bash root 3512 1761 13 06:46 ? 00:39:38 /usr/local/bin/redis-server *:6380 root 4793 1761 0 06:47 ? 00:00:00 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf 496 4794 4793 0 06:47 ? 00:00:00 nginx: worker process

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還可以單獨查看指定容器所屬docker子進程的PID。

docker inspect -f '{{.State.Pid}}' CONTAINERID

# docker inspect -f '{{.State.Pid}}' d14e1a6182eeed7c8f2a7c0a315a790a16bfbab1fdc7a73813cdeee494e8050a 1761