Hello,
I am new to Docker technology and currently I am facing a problem with outbound connection from containers.
I have done changes on host according to documentation:
net.ipv4.conf.all.forwarding=1
and
iptables -P FORWARD ACCEPT
Host - VM
cat /etc/os-release
NAME=“Oracle Linux Server”
VERSION=“7.5”
ID=“ol”
VERSION_ID=“7.5”
PRETTY_NAME=“Oracle Linux Server 7.5”
Docker:
docker version
Client: Docker Engine - Community
Version: 18.09.8-ol
API version: 1.39
Go version: go1.10.8
Git commit: 76804b7
Built: Fri Sep 27 21:00:18 2019
OS/Arch: linux/amd64
Experimental: false
Server: Docker Engine - Community
Engine:
Version: 18.09.8-ol
API version: 1.39 (minimum version 1.12)
Go version: go1.10.8
Git commit: 76804b7
Built: Fri Sep 27 20:54:00 2019
OS/Arch: linux/amd64
Experimental: false
Default Registry: docker.io
I run for connection testing busybox, but main app that should run is Apache web server.
This apache should work as proxy for accessing Tomcat, which is located on another VM.
Destination is reachable from host, but at the moment I cant reach anything outside of host from container. I can reach apache on exposed port, but communication wont leave container.
I have also noticed this > https://docs.docker.com/v17.09/engine/installation/linux/linux-postinstall/#ip-forwarding-problems
But since I have OL and not RHEL, this is probably not applicable.
Can anyone point me what else can be done to get it working?
Thanks
M.