(Last Updated On: April 1, 2018) A Docker registry is a storage and content delivery system that holds named Docker images, available in different tagged versions. Users using Docker interact with a registry by using docker push and docker pull commands. Sometimes it makes sense to store Docker images on a local registry rather than pushing them to Docker hub. You’ll save a lot of bandwidth for a big team and keep the images that you don’t want to be exposed to the public safe. Creating a local docker registry on CentOS 7 is a matter of following few steps. For installation of Docker on different distributions refer to Install and Configure Docker Registry on CentOS 7 Follow these steps to have docker registry installed and configured on your CentOS 7 server.
Linking MySQL volumes with docker-compose on Mac is giving permission errors (self.docker) submitted 2 years ago * by Jumballaya I am still new to Docker, I have only been using Docker beta for Mac for around 2 or 3 weeks. Get started with Docker for Mac Estimated reading time: 16 minutes Welcome to Docker for Mac! Docker is a full development platform for creating containerized apps, and Docker for Mac is the best way to get started with Docker on a Mac.
Step 1: Install docker registry package (docker-distribution) The docker-distribution package on CentOS 7.4 is available on extras repository. You may need to enable it if it’s disabled on your CentOS 7 system. $ sudo yum -y update $ sudo yum -y install docker-distribution Step 2: Configure Docker registry Docker registry configuration file is found on /etc/docker-distribution/registry/config.yml. Its format in YAML. If you need to make any modifications, do it here. Sample configuration file is shown below. From the default configuration file:. /var/lib/registry is the directory where docker images will be stored.
The service will bind to port 5000 on all network interfaces If you have SELinux enabled, you may encounter a problem using port 5000, consider disabling SELinux or putting it on permissive mode if you get issues. If firewalld is enabled and running, allow the port on the firewall. # firewall-cmd -add-port=5000/tcp -permanent # firewall-cmd -reload Step 3: Start docker registry service You can now start the service and set it to start on boot. # systemctl start docker-distribution # systemctl enable docker-distribution Confirm docker-distribution service is running.
Introduction Using Docker to containerize your applications and services can give you some security benefits out of the box, but a default Docker installation still has room for some security-related configuration improvements. The, a non-profit whose mission is to promote internet security best-practices, created. Subsequently, the Docker team released a security auditing tool – Docker Bench for Security – to run through this checklist on a Docker host and flag any issues it finds. In this tutorial we will install Docker Bench for Security, then use it to assess the security stance of a default Docker installation (from the official Docker repository) on an Ubuntu 16.04 host. We will then fix some of the issues that it warns us about. Our fixes mostly consist of the following two configuration updates:. Installing auditd and setting up auditing rules for the Docker daemon and its associated files.
Updating Docker's daemon.json configuration file We will not go into any details about creating secure containers, we will only focus on updates to the Docker host security in this tutorial. Prerequisites In order to complete this tutorial, you will need the following:. An Ubuntu 16.04 server with a sudo-enabled, non-root user. You can learn how to set this up with our guide. Docker installed from the official Docker repository, as covered in. Be sure to give your non-root user access to Docker by adding it to the docker group.
This is covered in Step 2 of the tutorial. Step 1 — Installing Docker Bench Security To begin, SSH into the Docker host as your non-root user. We will first clone the Docker Bench for Security script to the server using git, then run the script directly from the cloned repository. Navigate to a directory that your user can write to. In this example, we'll download the script to the user's home directory:.
cd Then clone the docker-bench-security Git repository:. git clone This will pull all the files from the repo and place them in a local docker-bench-security directory. Next, move into this resulting directory:. cd docker-bench-security Finally, to perform the security audit, run the docker-bench-security.sh script:./docker-bench-security.sh.
Output# - # Docker Bench for Security v1.3.4 # # Docker, Inc. (c) 2015- # # Checks for dozens of common best-practices around deploying Docker containers in production. # Inspired by the CIS Docker Community Edition Benchmark v1.1.0.
# - Initializing Tue Jun 5 18:59:11 UTC 2018 INFO 1 - Host Configuration WARN 1.1 - Ensure a separate partition for containers has been created NOTE 1.2 - Ensure the container host has been Hardened INFO 1.3 - Ensure Docker is up to date INFO. Using 18.03.1, verify is it up to date as deemed necessary. The script runs through a variety of tests and gives an INFO, NOTE, PASS, or WARN result for each one. A default Docker installation on Ubuntu 16.04 will pass many of these tests, but will show some warnings in sections 1,2, and 4.
In the remainder of this tutorial we will address these warnings by securing our Docker installation. Step 2 — Correcting Host Configuration Warnings The first section of the audit tests the configuration of your host's operating system, including its hardening, package versions, and auditing configuration. Let's look at the tests in this section: 1.1 Ensure a separate partition for containers has been created To ensure proper isolation, it's a good idea to keep Docker containers and all of /var/lib/docker on their own filesystem partition.
This can be difficult in some cloud hosting situations where you may not have the ability to partition drives. In these cases you could satisfy this test by moving Docker’s data directory to an external network-attached block device. To learn how to partition a drive, take a look at.
To mount a block storage device to a DigitalOcean Droplet, read. To learn how to mount block storage devices on other cloud platforms, refer to your provider's documentation. 1.2 Ensure the container host has been Hardened This test is just a note to remind you to consider hardening your host. Hardening usually involves setting up a firewall, locking down various services, setting up auditing and logging, and implementing other security measures.
You can get started with this by reading. 1.3 Ensure Docker is up to date This test prints out your Docker version.
You can check which version is the current stable release by visiting. If you're not up to date, and you installed Docker using apt-get install, you can use apt-get again to upgrade the Docker package:. sudo apt-get update. sudo apt-get upgrade 1.4 Ensure only trusted users are allowed to control Docker daemon In the we added our non-root user to the docker group to give it access to the Docker daemon. This test outputs the docker group's line from the /etc/group file. Outputdocker:x:999: sammy This line shows all the users included in the docker group. Review the line and make sure that only appropriate users are authorized to control the Docker daemon.
In the example above, our authorized user sammy is highlighted. To remove users from this group, you can use gpasswd:. gpasswd -d username docker 1.5–1.13 Ensure auditing is configured for various Docker files We need to install and configure auditd to enable auditing of some of Docker's files, directories, and sockets.
Auditd is a Linux access monitoring and accounting subsystem that logs noteworthy system operations at the kernel level. Install auditd with apt-get:. sudo apt-get install auditd This will install and start the auditd daemon. We’ll now configure auditd to monitor Docker files and directories.
In a text editor, open the audit rules file:. sudo nano /etc/audit/audit.rules You should see the following text.
/etc/audit/audit.rules -w /usr/bin/docker -p wa -w /var/lib/docker -p wa -w /etc/docker -p wa -w /lib/systemd/system/docker.service -p wa -w /lib/systemd/system/docker.socket -p wa -w /etc/default/docker -p wa -w /etc/docker/daemon.json -p wa -w /usr/bin/docker-containerd -p wa -w /usr/bin/docker-runc -p wa These rules instruct auditd to watch ( -w) the specified file or directory and log any writes or attribute changes ( -p wa) to those files. Restart auditd for the changes to take effect:. sudo systemctl restart auditd At this point, you’ve successfully configured auditd to watch Docker files and directories for suspicious changes. You can rerun the Docker Bench for Security script to confirm that the tests in Section 1 now pass. For more information on auditd, you can read our tutorial.
Despite being written for CentOS, the sections on configuring and using the auditing system apply equally to Ubuntu. Now that we’ve verified our host configuration, we’ll move on to Section 2 of the Docker security audit, the Docker daemon configuration. Step 3 — Correcting Docker Daemon Configuration Warnings This section of the audit deals with the configuration of the Docker daemon. These warnings can all be addressed by creating a configuration file for the daemon called daemon.json, to which we’ll add some security-related configuration parameters.
We’ll first create and save this configuration file, then review the tests and corresponding lines in the config one by one. To begin, open up the configuration file in your favorite editor:. sudo nano /etc/docker/daemon.json This will present you with a blank text file. Paste in the following. Outputuid=112(dockremap) gid=116(dockremap) groups=116(dockremap) If remapping container users to a different host user makes more sense for your use case, specify the user or user:group combination in place of default in the configuration file.
Warning: User remapping is a powerful feature that could cause disruptions and breakages if improperly configured, so highly recommended that you and be aware of the implications before implementing this change in a production setting. 2.11 Ensure that authorization for Docker client commands is enabled If you need to allow network access to the Docker socket you should to find out how to set up the certificates and keys necessary to do so securely.
We will not cover this process here, because the specifics depend too much on individual situations. The audit will continue to flag this test as a WARN, though access to the default local-only Docker socket is protected by requiring membership in the docker group so this can be safely ignored. 2.12 Ensure centralized and remote logging is configured In the Docker daemon configuration file, we’ve enabled standard syslog logging with the 'log-driver': 'syslog' line. You should then configure syslog to forward logs to a centralized syslog server.
This gets logs off the Docker host and away from any attacker who could alter or delete them. If you only want to forward Docker logs and don’t want to ship the syslog, you can specify the remote syslog server in the Docker configuration file by appending the following parameter to the file.