A Technical I.T./DevOps Blog
First, find the Docker container ID. Issue this:
docker ps -l
The results of the above command should provide the container ID. Next issue this:
docker inspect <containerID
For greater detail, see this posting.
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Continue reading “How To Find the IP Address of a Docker Container”
Docker is itself a dependency resolution tool. It is a container that allows a DevOps engineer to prepare one-time an OS environment with nuanced dependencies and configurations for other packages to be installed.
Leveraging the efficiency of a configuration management tool (such as Ansible, CFEngine, Chef, Puppet, and SaltStack) can empower DevOps engineering. It can also necessitate using duplicative deployments in different environments (development, quality assurance, staging, and production). Having a backup plan for disaster recovery is also important.
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Continue reading “How Do You Copy Files into a Docker Container from the Server’s Command Line?”
To see if Docker has started, do this command:
ps -ef | grep -i docker
If that returns only a service for the grep itself, then Docker is not running. Occasionally the Docker service won’t start through traditional methods. But some users have found that this command will work reliably:
docker daemon &
The “&” allows for the next prompt to return. This method is explicit to new users of Docker too.
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Continue reading “How to Handle “Failed to connect to the Docker daemon” message in Linux”
Containers, such as Docker, communicate to each other through a shared kernel. Guest virtual machines communicate to each other through the hypervisor or host operating system. Containers enjoy faster communication as staying within a shared kernel allows for more rapid communication than leaving a virtual machine and going out to a hypervisor (or host operating system) to communicate with another virtual machine. Containers allow for sequestration of processes and fewer operating systems licenses compared to having a comparable solution with virtual machines.
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Continue reading “Containerization Has Its Advantages Over Virtualization”