Docker Raw Format

Docker Raw File
Docker Raw Format Examples
Docker Raw Format Software
Docker Raw Format Example
Docker.raw File Size

Docker is configured to use a thin pool logical volume for storage but is still filling up /var/lib/docker. Running docker info shows plenty of data space available but my root file system is filling up with most space taken up in /var/lib/docker. With OpenShift 3 I am seeing that docker is filling up space on /var/lib/docker. Docker stats is a useful command to get an overview of the resource usage of your running Docker containers. For instance, you can see the current memory, CPU, and network usage of your containers.

July 12, 2020 | by Dominique St-Amand | Leave a comment

I was backing up a Linux server of mine the other day and I wanted to have a full backup (along with regular tar.gz backups) of the main disk mounted on the /dev/sda partition.

You can backup your partition using dd with a command such as dd if=/dev/sda|dd of=/home/archive/disk.img

If everything works, you will get an output similar to below:

Docker Raw File</h2><p>So which of these capabilities are a concern from a security perspective? Well to an extent that’s going to depend on how you’re using them. However there are some good starting points to look at, firstly there’s this post from the grsecurity forum that goes into the risks of allowing various capabilities. You can also look at the default list of capabilities that Docker allows (link above), as the ones they block are things that have been determined as dangerous in the context of containers.</p><h3>Other Utilities</h3><p>There are some other utilities which are handy for doing things like auditing capabilities. the libcap-ng-utils package has the very handy <code>filecap</code> and <code>pscap</code> programs which can be used to review capapbilties on all files and all processes on a system by default. There’s also <code>captest</code> which will review capabilities in the context of the current process.</p><p>Also if you’re running containers and want a nice quick way to assess capabilities amongst other things, you could use Jessie Frazelle’s amicontained</p><h3>Capabilities and Containers</h3><p>So what has all this to do with Containers? Well it’s worth noting what was mentioned early in this post which is, if you have a container which will run as a non-root user and which has no setuid or setgid root prgrams in it, you should be good to drop all capabilities. This adds another layer of hardening to the container, which can be helpful in preventing container breakout issues.</p><h2 id='docker-raw-format-examples'>Docker Raw Format Examples</h2><p>If you’re running with root containers, then it’s well worth reviewing the default list of capabilities that is provided by your container runtime an ensuring that you’re happy that these are needed.</p><h2 id='docker-raw-format-software'>Docker Raw Format Software</h2><p>Specifically there are ones like CAP_NET_RAW in the default docker set which could be dangerous (see here for more details)</p><h2 id='docker-raw-format-example'>Docker Raw Format Example</h2><h3>Capability Gotcha’s</h3><p>There are some gotcha’s to be aware of when using capabilities. First up is that, to use file capabilities, the filesystem you’re running from needs have extended attribute (xattr) support. A notable exception here is some versions of aufs that ship with some versions Debian and Ubuntu. This can impact Docker installs, as they’ll use aufs by default.</p><h2 id='dockerraw-file-size'>Docker.raw File Size</h2><p>Another one is that where you’re manipulating files you need to make sure that the tools you’re using understand capabilities. For example when backing up files with tar, you need to use the following switches to make it all work.</p><p>In practice for tar you’ll likely want to use <code>--xattrs</code> and <code>--xatttrs-include=security.capability</code> to make backups of files with capabilities.</p></p>
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