I am trying to configure a Docker container, running tengine on Ubuntu 14, to use syncookies. However I am facing some issues.
The host has net.ipv4.tcp_syncookies=1 enabled and syncookies work directly on the host. But the container on the same host does not use syncookies.
Does anyone know a way of getting the container to use syncookies?
Thanks in advance :).
I suspect the default bridge will be missing a lot of customizations you make on the host network interface. Bypass the bridge completely and attach the container directly to the host network (not a good general practice, but your use case is atypical) with a:
docker run --network host ...
Related
I am trying to setup my docker server which has two network interfaces eth0 going to my lan and eth1 going to a internal network for my vpn tunnel. And now all my containers are available through both interfaces. But I want to decide which containers are available through each interface.
I'm using docker-compose to start my containers and I have tried to create some docker networks and assign those, but I couldn't solve it that way. I also found something about macvlan networks but that seemed a bit to much for me. So I am wondering if there is another way or did I maybe misconfigure something? Or is macvlan still the easiest way to fix this?(if possible this way)
After doing some more digging i found another way which is easier to setup. I totally forgot this worked but you can just specify a which interface a port needs to bind to by giving the IP address of the interface when binding the port.
Like this when using docker run:
-p 192.168.1.100:8080:80/tcp
Or like this in docker compose:
ports:
- "192.168.1.100:8080:80/tcp"
Good morning!
Im using check point mobile to connect to my client VPN, and I have 2 containers in docker: mysql and karaf both sharing the network I created using the command docker network create --subnet=vpnAddress mynet
I used the command --network=mynet when running the containers.
Until here its all ok, I can connect via putty ssh to karaf, install the kar and all bundles are ok.
But when calling the services I realize that the container is not connected to the VPN, even so that I created a network with the VPN address. I need to be connected to the VPN in order to call the services.
Im connected externally(outside docker) to the VPN using the check point mobile, but I need docker to add/connect to the VPN.
Im using windows 10 (using docker with linux containers), I tried to go to C:\ProgramData\DockerDesktop\tmp-d4w and edit the file host.docker.internal too and change the IP to my VPN address, but none works.
I searched a lot, and I saw people talking about docker vpn images such as nordVpn or openVpn, but I cant use that.
I have been told I need to add the vpn network to docker, But im green at networking and I dont know how to do it, and what I did didn't work.
Hope you can help me. thanks!
edit: in docker engine i added the "bip": "vpnAddress/24"
I realize now that network bridge uses the VPN address now, tried to --network=bridge in both karaf and mysql container, but now karaf cant connect to mysql, but if I use the default docker create network mynet and run the 2 container using that network it works, but no luck with the VPN this way.
I haven't used Docker on Windows, but a quick look at some VPN containers shows that, in *nix at least, they use --device /dev/net/tun --cap-add=NET_ADMIN to expose the VPN "device" to the container. Other containers then use docker networking or links to connect to this VPN container - so looking at how the VPN containers do it might be helpful.
One suggestion for Mac seems to be using extra_hosts like so:
extra_hosts:
- "vpn.company.com:172.21.1.1"
You might be able to hack it with something like that. (or physically adding 172.21.1.1 vpn.company.com to /etc/hosts in the container). Also, checking for IP address conflicts between the Docker daemon and your host machine.
Windows docs seem to suggest they don't support network interfaces as "devices", so you probably need to either create a very specific docker network or modify host networking settings, starting with getting Docker daemon to recognize the VPN network.
See the Configure Advanced Networking section for some examples. I'd try creating a network associated with the VPN device first, then look into flags like --subnet and --gateway.
docker network create -d transparent \
-o com.docker.network.windowsshim.interface="Ethernet 2" TransparentNet2
This creates a network with a particular subnet and gateway, then runs a container with a statically-assigned IP on that network.
C:\> docker network create -d transparent \
--subnet=10.123.174.0/23 \
--gateway=10.123.174.1 MyTransparentNet
C:\> docker run -it --network=MyTransparentNet \
--ip=10.123.174.105 windowsservercore cmd
Good luck!
I have a docker container that needs to access an network server on the LAN. This server is visible from the docker host machine and I can access it from within the container when I reference the IP address directly.
However I need to be able to specify a url and port (e.g http://myserver:8080) rather than an IP address, which the docker container cannot resolve.
How can I configure the container to resolve this? ideally using the docker hosts dns. I have looked at many of the docs, but not being a DNS expert, it doesn't seem straightforward.
UPDATE:
I have tried this, which seems to work, but does this have any downsides or unintended consequences?
--network host
Thanks,
The rigth way to do this is to configure the docker daemon dns as specified under daemon-dns-options.
Using the host network is not recommended as it has some downsides https://docs.docker.com/network/host/
I am wondering if is it possible to connect to an app on local host from Docker container.
I run two Docker container which are connected to each other via link option. But how can I connect one of the containers to the local host?
Yes, use docker run --network=container:<container-id>
--network='container:': reuse another container's network stack
This let you run a container sharing the same network interface (then localhost) from another container.
Alternatively, you can use the host mode to give your containers the same network ips that the host has (including localhost). docker run --network=host:
--network= 'host': use the Docker host network stack
Docs: https://docs.docker.com/engine/reference/run/#name-name
I think it is possible.
Try communicate with the host's<ip:port>
ip: useip addror something similar to get the one of eth0，not the one of docker0
port：the one you assigned to the app
To make the process easier，perhaps turn selinux and firewall down when you try.
It is really easy to mount directories into a docker container. How can I just as easily "mount a port into" a docker container?
Example:
I have a MySQL server running on my local machine. To connect to it from a docker container I can mount the mysql.sock socket file into the container. But let's say for some reason (like intending to run a MySQL slave instance) I cannot use mysql.sock to connect and need to use TCP.
How can I accomplish this most easily?
Things to consider:
I may be running Docker natively if I'm using Linux, but I may also be running it in a VM if I'm on Mac or Windows, through Docker Machine or Docker for Mac/Windows (Beta). The answer should handle both scenarios seamlessly, without me as the user having to decide which solution is right depending on my specific Docker setup.
Simply assigning the container to the host network is often not an option, so that's unfortunately not a proper solution.
Potential solution directions:
1) I understand that setting up proper local DNS and making the Docker container (network) talk to it might be a proper, robust solution. If there is such a DNS service that can be set up with 1, max 2 commands and then "just work", that might be something.
2) Essentially what's needed here is that something will listen on a port inside the container and like a sort of proxy route traffic between the TCP/IP participants. There's been discussion on this closed Docker GH issue that shows some ip route command-line magic, but that's a bit too much of a requirement for many people, myself included. But if there was something akin to this that was fully automated while understanding Docker and, again, possible to get up and running with 1-2 commands, that'd be an acceptable solution.
I think you can run your container with --net=host option. In this case container will bind to the host's network and will be able to access all the ports on your local machine.