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If you’re in IT, you must be heard about Ansible. CIO calls it the DevOps “darling” for software automation, in recent times Ansible has come from nowhere to be the No. 1 choice for software automation in many organizations. StackShare lists shows that more than 1,000 companies that use Ansible, including Intel, Evernote, and Hootsuite, … Read more
Top 10 Container Monitoring Solutions/Tools in 2018 Native Docker cAdvisor Scout Pingdom Datadog Sysdig Prometheus Heapster / Grafana ELK stack Sensu Reference https://rancher.com/comparing-10-container-monitoring-solutions-rancher/
By default docker use https to connect to docker registry. But there can be use cases to use insecure registry. Here are the steps to use insecure registry. In ubuntu edit the file /etc/default/docker and update DOCKER_OPTS e.g where 10.84.34.155 is ipaddress of registry and 5000 is your port on which registry is configured. In … Read more
Docker Engine Docker Engine is our lightweight and powerful open source containerization technology combined with a work flow for building and containerizing your applications. Docker Engine is a client-server application with these major components: A server which is a type of long-running program called a daemon process (the dockerd command). A REST API which specifies … Read more
As of Version 0.12.0, Docker supports PAUSE and UNPAUSE commands to pause and resume containers using cgroup freezer. The docker pause command suspends all processes in the specified containers. On Linux, this uses the cgroups freezer. Traditionally, when suspending a process the SIGSTOP signal is used, which is observable by the process being suspended. With … Read more
We need to carefully understand the life cycle of Docker containes. There are following images which depicts the the right phases of docker containers. Phase of Docker Containers Create -> Destroy Create -> Start -> Stopped -> Destroy Create -> Start -> Pause -> Unpause Create -> Start -> Restart Image flow of Simple Docker … Read more
Port expose and publish has to happen when a container is created. Just stop the existing container and create a new one in its place with the added expose and/or publish options. By default Docker containers can make connections to the outside world, but the outside world cannot connect to containers. Each outgoing connection will … Read more
What is SELinux and how its SELinux used in Docker? There are three popular solutions for implementing access control in Linux: SELinux AppArmor GrSecurity Security-Enhanced Linux (SELinux) is a Linux kernel security module that provides a mechanism for supporting access control security policies. It is a security feature of the Linux kernel. It is designed … Read more
Docker is one of the revolutions technologies which has created lots of buzz in the Software development practices. Docker has not only helped to setup Continuous Integration and Delivery but also manage and replicate test environments and deploy a large at scale in no time. Here are the following advantages which benefit to testing team … Read more
Issues – docker-compose prepends current directory name to named volumes What actually happens is that the named volume gets prepended with (a simplified version of) the directory name from which the docker-compose command was run. For instance, if I run from the “dcompos-programs” directory, and I name the volume “my_named_vol”, then I end up with a … Read more