[LINUX] Proxy server with Docker


Build a proxy server with squid with Docker. I'm not doing anything special.

Target device and environment

Verification environment

Work content

Set masquerade in firewall

firewall-cmd --add-masquerade --zone=public --permanent
firewall-cmd --reload

Docker image preparation

Create an image so that it can be reused. Create an appropriate directory to put the Dockerfile and the configuration file.

mkdir -p /opt/docker/proxy
cd /opt/docker/proxy

Create a Dockerfile


FROM centos:centos8
ENV TZ='Asia/Tokyo'
RUN ln -sf /usr/share/zoneinfo/Asia/Tokyo /etc/localtime ; \
    dnf -y update ; dnf install -y squid ; \
    sed -i -e "s/http_port 3128/http_port 8080/" /etc/squid/squid.conf ;  \
    systemctl enable squid ; \
    dnf -y install rsyslog ;
COPY rsyslog.conf /etc
CMD [ "/usr/sbin/init" ]

Settings for syslog transfer

Transfer syslog to a remote location using the module ╩╗imfile that detects changes in the local log file. The forwarding destination is specified by UDP: 514 to the syslog server created in another entry. Since it belongs to the Docker network ╩╗infraserv-network for network services, it is possible to transfer under the host name syslog.


:syslogtag, isequal, "pseudolog_squid_access_log" @syslog:514

Build an image from a Dockerfile to create a container

Once you have created the Dockerfile, build it.

docker build --force-rm -t infraserv:proxy . -f ./proxy.df && \
docker run --cap-add sys_admin --security-opt seccomp:unconfined  -v /sys/fs/cgroup:/sys/fs/cgroup:ro \
  --network infraserv-network -it -d --name proxy --hostname proxy  -p 8080:8080 infraserv:proxy

If you get moss with dnf, the following command may work.

# firewall-cmd --add-masquerade --permanent
# firewall-cmd --reload

Operation check

Check with Diagnosis-kun, etc. http://taruo.net/e/

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