How to access host port from a docker container

bridge_host_tunnel_to_container.sh

## `How to access host port from a docker container`
## `Access host's ssh tunnel from docker container`
## `Prevent from using --net=host`
## ...
#    +-------------------+
#    |                   |
#    |                   |
#    |   local container |
#    |                   +---+
#    +-------------------+   |172.10.0.1
#                            |
#    +-------------------+ <-+              +----------------------+
#    |                   |                  |                      |
#    |                   |                  |                      |
#    |                   +^-----------------+                      |
#    |   local host A    +-v---------------v+    remote server B   |
#    |                   |                  |                      |
#    +-------------------+12345        98765+----------------------+
#

# 1. Make sure have enabled local host A openssh server's `GatewayPorts` options
#   (to `yes` or `clientspecified`)
sudo vim /etc/ssh/sshd_config
sudo systemctl restart ssh.service

# 2. Get the IP address of the `docker0` interface on your local host A
ip addr show docker0  # say 172.17.0.1

# 3. Establish a tunnel either from local host A or from remote server B
ssh -N -L 172.17.0.1:12345:localhost:98765 name@remoteHostB # from local host A
# or
ssh -N -R 172.17.0.1:12345:localhost:98765 name@localHostA # from remote server B

# 4. Now you can access the remote server B's port 98765
#    from local container via 172.17.0.1:12345

Reference

• https://stackoverflow.com/questions/39143689/access-hosts-ssh-tunnel-from-docker-container/52120176#52120176
• https://stackoverflow.com/questions/31324981/how-to-access-host-port-from-docker-container/31328031#31328031
• https://superuser.com/questions/588591/how-to-make-ssh-tunnel-open-to-public/591963#591963
• https://www.cyberciti.biz/faq/how-do-i-restart-sshd-daemon-on-linux-or-unix/
• https://www.tunnelsup.com/how-to-create-ssh-tunnels/

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