CODEWITHSUNDEEP
servicedockercentosstartupdockerfile
Nael
Nael

Reputation: 61

Starting services at container startup

I'm trying to run 3 services at my container startup (snmpd, sshd and centengine)

As runlevel is unknown in the container, services won't start.

I built an image with this Dockerfile : 

FROM centos:6.7
MAINTAINER nael <me@mail>

# Update CentOS
RUN yum -y update

# Install wget
RUN yum install -y wget

# Get Centreon Repo
RUN wget http://yum.centreon.com/standard/3.0/stable/ces-standard.repo -O /etc/yum.repos.d/ces-standard.repo

# Install Packages (SSH, sudo, Centreon Poller & Engine, SNMP)
RUN yum install -y --nogpgcheck openssh-clients openssh-server centreon-poller-centreon-engine sudo net-snmp net-snmp-utils

# Install supervisord
RUN rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
RUN yum --enablerepo=epel install -y supervisor
RUN mv -f /etc/supervisord.conf /etc/supervisord.conf.org
ADD supervisord.conf /etc/

# For sshd & centengine
EXPOSE 22 5669

# Change user password
RUN echo -e "password" | (passwd --stdin user)

# Disable PAM (causing issues while ssh login)
RUN sed -ri 's/UsePAM yes/#UsePAM yes/g' /etc/ssh/sshd_config
RUN sed -ri 's/#UsePAM no/UsePAM no/g' /etc/ssh/sshd_config

# Start supervisord
CMD ["/usr/bin/supervisord"]

Here is the supervisord.conf file

[supervisord]
nodaemon=true
pidfile=/var/run/supervisord.pid
logfile=/var/log/supervisor/supervisord.log

[program:centengine]
command=service centengine start

[program:snmpd]
command=service snmpd start

[program:sshd]
command=service sshd start

But with this Dockerfile and supervisord.conf, when I start my container theses services aren't running.

What could be the problem ?

Upvotes: 3

Views: 8786

Answers (2)

Mark Riggins
Mark Riggins

Reputation: 195

You may find my dockerfy utility useful starting services, pre-running initialization commands before the primary command starts. See https://github.com/markriggins/dockerfy

For example:

RUN wget https://github.com/markriggins/dockerfy/releases/download/0.2.4/dockerfy-linux-amd64-0.2.4.tar.gz; \
    tar -C /usr/local/bin -xvzf dockerfy-linux-amd64-*tar.gz; \
    rm dockerfy-linux-amd64-*tar.gz;


ENTRYPOINT dockerfy 
COMMAND --start bash -c "while false; do echo 'Ima Service'; sleep 1; done" -- \
    --reap -- \
    nginx

Would run a bash script as a service, echoing "Ima Service" every second, while the primary command nginx runs. If nginx exits, then the "Ima Service" script will automatically be stopped.

As an added benefit, any zombie processes left over by nginx will be automatically cleaned up.

You can also tail log files such as /var/log/nginx/error.log to stderr, edit nginx's configuration prior to startup and much more

Upvotes: 0

Nael
Nael

Reputation: 61

Not anymore using supervisord.

I just include a script with all the services ... start commands in the Dockerfile. When I create my container with docker run ... I just specify that I want to start it with my script.

& that's working very well.

Thanks @warmoverflow for trying to solve this.

Upvotes: 1

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