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<nav class="md-nav md-nav--secondary" aria-label="Table of contents"> <label class="md-nav__title" for="__toc"> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> <li class="md-nav__item"> <a href="#can-i-use-mergerfs-without-snapraid-snapraid-without-mergerfs" class="md-nav__link"> <span class="md-ellipsis"> Can I use mergerfs without SnapRAID? SnapRAID without mergerfs? </span> </a> </li> <li class="md-nav__item"> <a href="#does-mergerfs-support-cow-copy-on-write-writes-to-read-only-filesystems" class="md-nav__link"> <span class="md-ellipsis"> Does mergerfs support CoW / copy-on-write / writes to read-only filesystems? </span> </a> </li> <li class="md-nav__item"> <a href="#can-mergerfs-run-via-docker-podman-kubernetes-etc" class="md-nav__link"> <span class="md-ellipsis"> Can mergerfs run via Docker, Podman, Kubernetes, etc. </span> </a> </li> </ul> </nav> </div> </div> </div> <div class="md-content" data-md-component="content"> <article class="md-content__inner md-typeset">
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<h1 id="compatibility-and-integration">Compatibility and Integration</h1><h2 id="can-i-use-mergerfs-without-snapraid-snapraid-without-mergerfs">Can I use mergerfs without SnapRAID? SnapRAID without mergerfs?</h2><p>Yes. They are completely unrelated pieces of software that just happento work well together.</p><h2 id="does-mergerfs-support-cow-copy-on-write-writes-to-read-only-filesystems">Does mergerfs support CoW / copy-on-write / writes to read-only filesystems?</h2><p>Not in the sense of a filesystem like BTRFS or ZFS nor in theoverlayfs or aufs sense. It does offer a<a href="http://manpages.ubuntu.com/manpages/bionic/man1/cow-shell.1.html">cow-shell</a>like hard link breaking (copy to temp file then rename over original)which can be useful when wanting to save space by hardlinkingduplicate files but wish to treat each name as if it were a unique andseparate file.</p><p>If you want to write to a read-only filesystem you should look atoverlayfs. You can always include the overlayfs mount into a mergerfspool.</p><h2 id="can-mergerfs-run-via-docker-podman-kubernetes-etc">Can mergerfs run via Docker, Podman, Kubernetes, etc.</h2><p>Yes. With Docker you'll need to include <code>--cap-add=SYS_ADMIN--device=/dev/fuse --security-opt=apparmor:unconfined</code> or similar withother container runtimes. You should also be running it as root orgiven sufficient caps to change user and group identity as well ashave root like filesystem permissions.</p><p>Keep in mind that you <strong>MUST</strong> consider identity when usingcontainers. For example: supplemental groups will be picked up fromthe container unless you properly manage users and groups by sharingrelevant /etc files or by using some other means to share identityacross containers. Similarly, if you use "rootless" containers and usernamespaces to do uid/gid translations you <strong>MUST</strong> consider that whilemanaging shared files.</p><p>Also, as mentioned by <a href="https://hotio.dev/containers/mergerfs">hotio</a>,with Docker you should probably be mounting with <code>bind-propagation</code>set to <code>slave</code>.</p>
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