使用nsenter连接容器
下载安装包：wget https://www.kernel.org/pub/linux/utils/util-linux/v2.29/util-linux-2.29.1.tar.gz
解压、编译
[root@wuhan31-ceph01 util-linux-2.29.1]# ./configure -without-ncurses
checking for gcc... no
checking for cc... no
checking for cl.exe... no
configure: error: in `/root/xiaoxuan/util-linux-2.29.1':
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details安装gccyum install gcc -y
继续编译然后make #注意不要make install
make结束后将编译出的程序nsenter放到/usr/local/bin/cp nsenter /usr/local/bin/
现在就可以使用nsenter命令了
例：先找出一个容器ip
[root@wuhan31-ceph01 ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
d141ac504ec6 kolla/centos-source-grafana:rocky "dumb-init --single-…" 2 months ago Up 2 days grafana
41e12c24ba7f kolla/centos-source-horizon:rocky "dumb-init --single-…" 2 months ago Up 2 days horizon
6989a4aeb33a kolla/centos-source-heat-engine:rocky "dumb-init --single-…" 2 months ago Up 2 days heat_engine
35665589b4a4 kolla/centos-source-heat-api-cfn:rocky "dumb-init --single-…" 2 months ago Up 2 days heat_api_cfn
f18c98468796 kolla/centos-source-heat-api:rocky "dumb-init --single-…" 2 months ago Up 2 days heat_api
bc77f4d3c957 kolla/centos-source-neutron-metadata-agent:rocky "dumb-init --single-…" 2 months ago Up 2 days neutron_metadata_agent
7334b93c6564 kolla/centos-source-neutron-lbaas-agent:rocky "dumb-init --single-…" 2 months ago Up 2 days neutron_lbaas_agent
0dd7a55245c4 kolla/centos-source-neutron-l3-agent:rocky "dumb-init --single-…" 2 months ago Up 2 days neutron_l3_agent
beec0f19ec7f kolla/centos-source-neutron-dhcp-agent:rocky "dumb-init --single-…" 2 months ago Up 2 days neutron_dhcp_agent
af6841ebc21e kolla/centos-source-neutron-linuxbridge-agent:rocky "dumb-init --single-…" 2 months ago Up 2 days neutron_linuxbridge_agent
49dc0457445d kolla/centos-source-neutron-server:rocky "dumb-init --single-…" 2 months ago Up 2 days neutron_server
677c0be4ab6b kolla/centos-source-nova-compute:rocky "dumb-init --single-…" 2 months ago Up 2 days nova_compute
402b1e673777 kolla/centos-source-nova-novncproxy:rocky "dumb-init --single-…" 2 months ago Up 2 days nova_novncproxy
e35729b76996 kolla/centos-source-nova-consoleauth:rocky "dumb-init --single-…" 2 months ago Up 2 days nova_consoleauth
8b193f562e47 kolla/centos-source-nova-conductor:rocky "dumb-init --single-…" 2 months ago Up 2 days nova_conductor
885581445be0 kolla/centos-source-nova-scheduler:rocky "dumb-init --single-…" 2 months ago Up 2 days nova_scheduler
171128b7bcb7 kolla/centos-source-nova-api:rocky "dumb-init --single-…" 2 months ago Up 2 days nova_api
8d7f3de2ad63 kolla/centos-source-nova-placement-api:rocky "dumb-init --single-…" 2 months ago Up 2 days placement_api
ab763320f268 kolla/centos-source-nova-libvirt:rocky "dumb-init --single-…" 2 months ago Up 2 days nova_libvirt
bbd4c3e2c961 kolla/centos-source-nova-ssh:rocky "dumb-init --single-…" 2 months ago Up 2 days nova_ssh
80e7098f0bfb kolla/centos-source-cinder-backup:rocky "dumb-init --single-…" 2 months ago Up 2 days cinder_backup
20e2ff43d0e1 kolla/centos-source-cinder-volume:rocky "dumb-init --single-…" 2 months ago Up 2 days cinder_volume
6caba29f7ce2 kolla/centos-source-cinder-scheduler:rocky "dumb-init --single-…" 2 months ago Up 2 days cinder_scheduler
3111622e4e83 kolla/centos-source-cinder-api:rocky "dumb-init --single-…" 2 months ago Up 2 days cinder_api
2c011cfae829 kolla/centos-source-glance-api:rocky "dumb-init --single-…" 2 months ago Up 2 days glance_api
be84e405afdd kolla/centos-source-kafka:rocky "dumb-init --single-…" 2 months ago Up 2 days kafka
09aef04ad59e kolla/centos-source-keystone-fernet:rocky "dumb-init --single-…" 2 months ago Up 2 days keystone_fernet
2ba9e19844fd kolla/centos-source-keystone-ssh:rocky "dumb-init --single-…" 2 months ago Up 2 days keystone_ssh
8eebe226b065 kolla/centos-source-keystone:rocky "dumb-init --single-…" 2 months ago Up 2 days keystone
662d85c00a64 kolla/centos-source-rabbitmq:rocky "dumb-init --single-…" 2 months ago Up 2 days rabbitmq
7d373ef0fdee kolla/centos-source-mariadb:rocky "dumb-init kolla_sta…" 2 months ago Up 2 days mariadb
ab9f5d612925 kolla/centos-source-memcached:rocky "dumb-init --single-…" 2 months ago Up 2 days memcached
a728298938f7 kolla/centos-source-kibana:rocky "dumb-init --single-…" 2 months ago Up 2 days kibana
7d22d71cc31b kolla/centos-source-keepalived:rocky "dumb-init --single-…" 2 months ago Up 2 days keepalived
dae774ca7e33 kolla/centos-source-haproxy:rocky "dumb-init --single-…" 2 months ago Up 2 days haproxy
14b340bb8139 kolla/centos-source-redis-sentinel:rocky "dumb-init --single-…" 2 months ago Up 2 days redis_sentinel
3023e95f465f kolla/centos-source-redis:rocky "dumb-init --single-…" 2 months ago Up 2 days redis
a3ed7e8fe8ff kolla/centos-source-elasticsearch:rocky "dumb-init --single-…" 2 months ago Up 2 days elasticsearch
06b28cd0f7c7 kolla/centos-source-zookeeper:rocky "dumb-init --single-…" 2 months ago Up 2 days zookeeper
630219f5fb29 kolla/centos-source-chrony:rocky "dumb-init --single-…" 2 months ago Up 2 days chrony
6f6189a4dfda kolla/centos-source-cron:rocky "dumb-init --single-…" 2 months ago Up 2 days cron
039f08ec1bbf kolla/centos-source-kolla-toolbox:rocky "dumb-init --single-…" 2 months ago Up 2 days kolla_toolbox
f839d23859cc kolla/centos-source-fluentd:rocky "dumb-init --single-…" 2 months ago Up 2 days fluentd如：先找出容器ID
[root@wuhan31-ceph01 ~]# docker ps -a | grep -w mariadb | awk '{print $1}'
7d373ef0fdee通过容器ID找出容器PID
[root@wuhan31-ceph01 ~]# docker inspect --format "{{ .State.Pid }}" 7d373ef0fdee
8144通过容器PID连接
[root@wuhan31-ceph01 ~]# nsenter --target 8144 --mount --uts --ipc --net --pid
()[root@wuhan31-ceph01 /]# 这样就连接到容器了，
为了方便这里做了一个脚本：
#!/bin/bash
#
# Description: This is sysytem optimization scripts about centos !
################################################################
# Author：tommy xiao
# QQ: 610000107
# Date: 2019.07.31
################################################################
# Variable settings
CONTAINER_NAME=$1
if [ ! -n "$CONTAINER_NAME" ];then
echo -e "\033[40;33mUsage: /bin/bash docker.sh container_name\n\033[40;37m"
else
CONTAINER_ID=`docker ps -a | grep $CONTAINER_NAME -w | awk '{print $1}'`
echo -e "\033[40;32mContainer ID：$CONTAINER_ID!!!\n\033[40;37m"
CONTAINER_PID=`docker inspect --format "{{ .State.Pid }}" $CONTAINER_ID`
echo -e "\033[40;32mContainer PID：$CONTAINER_PID\n\033[40;37m"
echo -e "\033[40;32mStart connecting container\n\033[40;37m"
nsenter --target $CONTAINER_PID --mount --uts --ipc --net --pid
fi