sameersbn/squid Docker Image

sameersbn/squid:3.5.27-2

• Introduction
  • Contributing
  • Issues
• Getting started
  • Installation
  • Quickstart
  • Command-line arguments
  • Persistence
  • Configuration
  • Usage
  • Logs
• Maintenance
  • Upgrading
  • Shell Access

Introduction

Dockerfile to create a https://www.docker.com/ container image for http://www.squid-cache.org/.

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator.

Contributing

If you find this image useful here's how you can help:

• Send a pull request with your awesome features and bug fixes
• Help users resolve their issues.
• Support the development of this image with a http://www.damagehead.com/donate/

Issues

Before reporting your issue please try updating Docker to the latest version and check if it resolves the issue. Refer to the Docker https://docs.docker.com/installation for instructions.

SELinux users should try disabling SELinux using the command setenforce 0 to see if it resolves the issue.

If the above recommendations do not help then report your issue along with the following information:

• Output of the docker version and docker info commands
• The docker run command or docker-compose.yml used to start the image. Mask out the sensitive bits.
• Please state if you are using Boot2Docker, [***] etc.

Getting started

Installation

Automated builds of the image are available on https://hub.docker.com/r/sameersbn/squid and is the recommended method of installation.

Note: Builds are also available on https://quay.io/repository/sameersbn/squid

bash
docker pull sameersbn/squid:3.5.27-2

Alternatively you can build the image yourself.

bash
docker build -t sameersbn/squid github.com/sameersbn/docker-squid

Quickstart

Start Squid using:

bash
docker run --name squid -d --restart=always \
  --publish 3128:3128 \
  --volume /srv/docker/squid/cache:/var/spool/squid \
  sameersbn/squid:3.5.27-2

Alternatively, you can use the sample docker-compose.yml file to start the container using https://docs.docker.com/compose/

Command-line arguments

You can customize the launch command of the Squid server by specifying arguments to squid on the docker run command. For example the following command prints the help menu of squid command:

bash
docker run --name squid -it --rm \
  --publish 3128:3128 \
  --volume /srv/docker/squid/cache:/var/spool/squid \
  sameersbn/squid:3.5.27-2 -h

Persistence

For the cache to preserve its state across container shutdown and startup you should mount a volume at /var/spool/squid.

The Quickstart command already mounts a volume for persistence.

SELinux users should update the security context of the host mountpoint so that it plays nicely with Docker:

bash
mkdir -p /srv/docker/squid
chcon -Rt svirt_sandbox_file_t /srv/docker/squid

Configuration

Squid is a full featured caching proxy server and a large number of configuration parameters. To configure Squid as per your requirements mount your custom configuration at /etc/squid/squid.conf.

bash
docker run --name squid -d --restart=always \
  --publish 3128:3128 \
  --volume /path/to/squid.conf:/etc/squid/squid.conf \
  --volume /srv/docker/squid/cache:/var/spool/squid \
  sameersbn/squid:3.5.27-2

To reload the Squid configuration on a running instance you can send the HUP signal to the container.

bash
docker kill -s HUP squid

Usage

Configure your web browser network/connection settings to use the proxy server which is available at 172.17.0.1:3128

If you are using Linux then you can also add the following lines to your .bashrc file allowing command line applications to use the proxy server for outgoing connections.

bash
export ftp_proxy=http://172.17.0.1:3128
export http_proxy=http://172.17.0.1:3128
export https_proxy=http://172.17.0.1:3128

To use Squid in your Docker containers add the following line to your Dockerfile.

dockerfile
ENV http_proxy=http://172.17.0.1:3128 \
    https_proxy=http://172.17.0.1:3128 \
    ftp_proxy=http://172.17.0.1:3128

Logs

To access the Squid logs, located at /var/log/squid/, you can use docker exec. For example, if you want to tail the access logs:

bash
docker exec -it squid tail -f /var/log/squid/access.log

You can also mount a volume at /var/log/squid/ so that the logs are directly accessible on the host.

Maintenance

Upgrading

To upgrade to newer releases:

1. Download the updated Docker image:

bash
docker pull sameersbn/squid:3.5.27-2

2. Stop the currently running image:

bash
docker stop squid

3. Remove the stopped container

bash
docker rm -v squid

4. Start the updated image

bash
docker run -name squid -d \
  [OPTIONS] \
  sameersbn/squid:3.5.27-2

Shell Access

For debugging and maintenance purposes you may want access the containers shell. If you are using Docker version 1.3.0 or higher you can access a running containers shell by starting bash using docker exec:

bash
docker exec -it squid bash