Posted: (1 week ago) Feb 04, 2020 Depending on your Ubuntu 20.04 Server/Desktop installation your system might not come with the ping command pre-installed. This is especially the case for docker containers. Any attempt to ping a remote system will result in the following error: › Course Detail: www.linuxconfig.org Show All Course. # To save the changes, find the ID of the container you just created first $ docker ps -l ID IMAGE COMMAND CREATED STATUS PORTS 69 ubuntu:12.04 apt-get install ping 1 minute ago Exit 0 $ docker commit 698 learn/ping effb66b31edb # - Docker has returned a new ID. This id is the image id. Route add “Docker container network” “Linux VM IP” for example # route add 172.17.0.0/16 192.168.1.20 Solution no. 4: setup: PC-A a is docker host, PC-B is a another PC in the network. To ping/access docker’s container from PC-B, run the below iptables-rules in the host. Docker container exec -it bridge01 bash apt-get update && apt-get install net-tools apt-get install iputils-ping Step3: We will check the ip address for bridge02. So, to ping to this container.
- Docker Apt Install Ping
- Docker Install Ping Command
- Docker Yum Install Ping
- Docker Install Ping Checker
- Docker Install Ping
- Docker Ping Server
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Docker Apt Install Ping
Docker is great. We all know containers help simplify and automate the development and setup of an application environment. Let's explore how we can establish communication between containers and from the inside to the host machine.
First of all, we'll provide a little context. To understand how the process of communication works, we'll need to clarify some concepts first.
When you list the networks after a traditional installation of Docker and run the following command
docker network ls...
...you might get the default in-built networks:
Note: As you probably noticed, there is another one called local_default, which in this case is a user-defined bridge network.
Docker Install Ping Command
A brief overview extracted from the current Docker documentation states:
Bridge network: The default network driver. If you don’t specify a driver, this is the type of network you are creating. Bridge networks are usually used when your applications run in standalone containers that need to communicate
Host network: Adds a container on the host’s network stack. As far as the network is concerned, there is no isolation between the host machine and the container. For instance, if you run a container that runs a web server on port 80 using host networking, the web server is available on port 80 of the host machine.
None network: Is generally known as container specific network. A container can be attached to a none network. This allows internal communication between containers that are isolated to outside networks.1
Therefore, the network in charge of the communication process between containers is by default the bridge network or the user-defined bridge networks, so let’s focus on this type of network.
When you start Docker, a default bridge network (also called
docker0) is created automatically, and newly-started containers connect to it unless otherwise specified. You can also create user-defined custom bridge networks. User-defined bridge networks are superior to the default bridge network.
In terms of Docker, a bridge network uses a software bridge which allows containers connected to the same bridge network to communicate, while providing isolation from containers which are not connected to that bridge network. The Docker bridge driver automatically installs rules in the host machine so that containers on different bridge networks cannot communicate directly with each other.
The communication would be established only if the bridge network is provided and the proper permissions on the iptables rules are given.
Ping Between Containers
To understand the communication between containers, let’s create two containers over the same network and make sure that they can see each other using a ping command.
- Create two containers.
- Create a custom network.
- List the networks. You should see a new network type bridge created.
Docker Yum Install Ping
- Connect the network with the containers.
docker network connect my-custom-net nginx1
docker network connect my-custom-net nginx2
- Inspect the network. You should see the containers attached to the network.
- Before you try to make the ping, you should install
iputils-pingin the container to make it work. So we enter into the container named
- You’re ready to run a ping command.
Connecting the Container to a Service Inside the Host
Docker allows you to have access to the host from the containers through a special DNS named
Docker Install Ping Checker
You can run ping inside the container
nginx1. You will get a response with your current host IP
Docker Install Ping
In a nutshell, we achieved a better understanding of how bridge networks in Docker make communication easier between containers in the same network. If required, we can connect our containers to any service on our host using the special host.docker.internal.
Docker Ping Server
'Networking overview,' Docker Docs. ↩