docker filling up root partition

to your /etc/docker/daemon.json to restrict log size and growth in the future or set the log-driver to "journald" to eliminate log files entirely. The on-access scanning does frequent I/Os to the /tmp directory as it operates. Additionnal options for such mount point (more precisely) and better to allow space according to needs. Prior to the A/V mandate, our systems were built with /tmp placed onto an LV of the root disk. i) Separation of file systems ensures easier management of hard links (only possible within the same file system). Apparently, the application installer requires hardlinks between files in /tmp, /home and /. There's a reason that the second verse of the old classic "The C Days of Y2K" is "/var is full". If you have a modern storage subsystem like ZFS, you can have your separate "filesystem" while still retaining the usage-flexibility of a /+swap layout. udev 1.9G 0 1.9G 0% /dev Apparently not. I prefere too separate (and far away !) Id probably be better off just making a backup before I change anything. If / is full, that usually results in a zero byte file. it uses tmp to extract archives? shm 64M 0 64M 0% /var/lib/docker/containers/916d2e317dec8d821c1605e331c1c8c2e48a081bee61c322a812ee3f9d7c86d1/mounts/shm There are files that have lower impact if they are rewritten to zero bytes, but really, why take the chance? There is a commonly held wisdom that /var should by default be seperated from the root partition (for example https://access.redhat.com/site/articles/10332). 99M 339936f1ea899c8fb76cf12828cb8b8d1f4a8c66c0ee8b580c17472146f78a3e Why doesn't the bootstrap diode in the half-bridge driver cause the high side to be driven at a lower voltage than the low side? That would be the easiest solution, yeah. List of commands run which should show what I have tried and the current status: Trending sort is based off of the default sorting method by highest score but it boosts votes that have happened recently, helping to surface more up-to-date answers. Thanks for that extra detail - that sounds good to know. How Can Cooked Meat Still Have Protein Value? Hands up if anyone likes to be waken up at night because of disk issue in, say /home? Increase visibility into IT operations to detect and resolve technical issues before they impact your business. Some servers have additional logical volumes as needed for unique data that might threaten "/". There's also the oft-forgotten /var/tmp/ directory, which OFFICIALLY1 is expected to be world-writeable (sticky-bit'd) persistent storage -- i.e., storage available between reboots (in contrast to /tmp/ which doesn't have that requirement; indeed, in many modern Linux distros /tmp/ is an in-RAM tmpfs). The seriousness of a filled /var is already quite substantial - systems will not function properly, I imagine / filling at the time would only be a small incremental danger. 1. Is there a consensus on the fstab defaults nodev, noexec for /home, /var/*, /tmp/* (and anything exported via NFS) Asking around the building, the commonly stated reason tended to be that /var could easily be filled by a (possibly misbehaved) application, and that if it wasn't seperate from / the filling of / would cause a kernel would panic. 5.9M 8986b8466083398936d4bf113532a5a1a5bb22b57c246fc28d487e4dec4d595a How do I get into a Docker container's shell? tmpfs 5.0M 0 5.0M 0% /run/lock To subscribe to this RSS feed, copy and paste this URL into your RSS reader. From inside of a Docker container, how do I connect to the localhost of the machine? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Can you let me know of any way I can make use of more space without having to resize partitions? Even though I have successfully (?) Here is the howto: This topic was automatically closed 30 days after the last reply. Luckily the closest I have come to this pain is a mandate to install A/V on any Linux servers hosting Windows shares. Its risky business while theyre mounted and data loss isnt something anyone likes to deal with. c) Separation of file systems provides simpler creation and maintenance of LVM snapshots. It's quite dreadful. I mean, other than a one-off, personal-desktop kind of environment, /home is rarely on the same device as /tmp. https://workbench.cisecurity.org/benchmarks/9090/sections/1149641. I am using a docker based application which uses containers to provide microservices, Over a long run, my root filesystem is filed up. Users using it to stash useless files. So it becomes a tradeoff, one big partition for / and /var lowers the chance that /var will fill due to applications writing to /var but increases the consequence of /var filling (being that / will fill at the same time.). Engage with our Red Hat Product Security team, access security updates, and ensure your environments are not exposed to any known security vulnerabilities. Here is a helpful snippet from the Arch Wiki Docker article: Images location "Is there some additional risk to / filling that I haven't observed?" Another solution on OS level can be to mount /var/lib/docker on a dedicated partition. OS: Ubuntu 18.04.3 LTS server Also, for todays small vm servers, partitioning out so many file systems will double your disk needs . For home, on my raspberry pies, I'm not as zealous, unless it's public facing. Also i can see so many directories inside overlay2 . Why? 2.7G var Is there a name for this fallacy when someone says something is good by only pointing out the good things? 4.2M 3bb2e0622f6b8c66951442600af071ea0719682ad985de87fb2af98d261ea842 j) Separation of file systems ensures easier management of file system checks. 28M 89d1c9fb6abb68c47e4a9132f6011470a6de4280ce58b2ada1ac03bf1c87785d Announcing the Stacks Editor Beta release! @John Westerdale said: Is there a consensus for a General Purpose server layout? d) Separation of file systems enforces rule of "not putting all eggs in one basket". overlay 14G 11G 2.4G 83% /var/lib/docker/overlay2/84f3ebcb60fef50685a6f4dd4bfcf718f90f3e033c3c7ea5f7249adda07134ac/merged Is any finite-dimensional algebra a sub-algebra of a finite-group algebra? root@ubuntu2:/var/lib/docker/overlay2# du -sch * |grep M overlay 14G 7.0G 6.1G 54% /var/lib/docker/overlay2/84f3ebcb60fef50685a6f4dd4bfcf718f90f3e033c3c7ea5f7249adda07134ac/merged Asking for help, clarification, or responding to other answers. Like I stated above it would depened on the sensitivity of the applications or services which this system or systems are running. (If there is any kernel panic? More like San Francis-go (Ep. If we can't write to /var/log nothing works (such as logins), so we're protecting that. "Is a full / any more likely to cause a kernel panic than a full /var? In my recent experience I agree. Whenever I can, I insist on having separate file systems, like: a) No need to worry about, say /home, wasting all the space in root file system. That's less a use-case for partitions than separate storage. /var is a bit different. How to get a Docker container's IP address from the host, Docker: Copying files from Docker container to host. 7.2M 212c489a9851069b6af4be3c6a1985f2dcaeec96917153cd052dad7d7357cd2c I have been trying to, but after running an install with the defaults I have only been able to separate /var/log and /var/log/audit from /. Thanks! /dev/mapper/ubuntu2vg-root 14G 11G 2.4G 83% / I really disdain having to drop whatever I'm doing and fix a / partition that has been filled up. overlay 14G 11G 2.4G 83% /var/lib/docker/overlay2/765167142da4fc17cf988ebfa7bf672a43266792aed252c75455e368caa680f6/merged 45M 4bf199e36ed98f2b1001c0baaca4cce18d3f939008c9d020f89d4269837be4a6 Why is Docker filling up /var/lib/docker/overlay2? Ideally you should be mounting /var with noexec and nosuid flags. 2.4M c63930962bacdd9505c5e68811f209feae4fd8ed01c0a59959ba5e5a72be6f1c I've had systems where a full / filesystem will hide problems until the next crash or boot, whichever happens first. Remove the old directory if everything is fine. Yes, that should be taken care of in engineering, agreed. Is the US allowed to execute a airstrike on Afghan soil after withdrawal? So, I'm resurrecting this thread just to share my current experience. Is there some additional risk to / filling that I haven't observed? I ran your suggested ps commands: $ docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES, I dont know whats happening with my machine, it sometimes just errors out for some reason, sometimes. overlay 14G 7.0G 6.1G 54% /var/lib/docker/overlay2/bb3fcf5eb730f23c40d8a60013c99c8844be6cdb37b8b98f67c01ac1b531b4cd/merged This topic, though related to digital ocean block storage, can help you at least for uploads: You should read all the topic, there are pros and cons. Connect and share knowledge within a single location that is structured and easy to search. Ill report back. It has come down to 7G from 11G in df output. Let me ask again: how can a 4.3G folder (which will be even less if you messure right) be responsible to fill up a 14G partition?! There are many ways of skinning this, just keep postgres_data on the fastest drive and you should be good. root@ubuntu2:/# overlay 14G 7.0G 6.1G 54% /var/lib/docker/overlay2/765167142da4fc17cf988ebfa7bf672a43266792aed252c75455e368caa680f6/merged I think the same things like a lot of here. Please add -x to your du command. The likelihood probably depends on what the kernel is doing though. :), According to the Filesystem Hierarchy Standard. Why bother with a %post action for that? In this article I'll talk briefly about how I fixed this problem, the resources and tools I picked up along the way, and anything else I have learned along the way. shm 64M 0 64M 0% /var/lib/docker/containers/e61ce55f117e9be2528dca8053bcab1ecc6c2f5297840e0aa8dadfe3603ef548/mounts/shm Im not sure if a test droplet is the best way to go, in my case. Good points were raised by many esteemed colleagues in the forum. You also doubled your backup sizes on image backups. all to handle fears about yesterday's monolithic servers. and it seems to be old fashion style but efficient. tmpfs 395M 1.2M 394M 1% /run First post here, sadly its regarding support. Based on @sams suggestion I spun up a new droplet installed Discourse added a block storage volume moved uploads and backups to that volume. g) Separation of file systems ensures less escalations to sysadmins due to space problems. 4.3G total 1.7M 4d45dd15c08c8c3f6aade9e2ecba4755ed33edb2dc06bdd5374448e8d055d71b It killed our Linux systems until we started converting them to tmpfs. Naturally there are case specific reasons to split off /var (or a subset of /var) into its on file system, though in the general case I'm wondering what the reasons are. The whole df output is worth nothing, as it repeatedly shows the stats of /dev/mapper/ubuntu2vg-root for different overlay mounts and shm memory mounts. Just the other day a system filled / because something that writes to /var/log/spool/ created a mess. overlay 14G 11G 2.4G 83% /var/lib/docker/overlay2/a2bc956d174f1e84becea809d036a932cd96e434f886eea6fb23abf50ec31b44/merged 468), Monitoring data quality with Bigeye(Ep. If they fill it, don't send me alerts, send to them, alert me if something I manage/control breaks. Or you have a partitioning scheme for critical servers in order to mitigate any potential downtime caused by anything writing to /var/log and the like. 2.4M 38efaa93222a33f819482080e0950292d3ab061396284554e24f23194d37e653 Does this mean my summary interpretation is also on the right track? Too many solutions with root filesystem in one partition. Thanks for contributing an answer to Stack Overflow! Similarly, it means that you can use different fs-types optimized to a given partition's workload. Moved to tmpfs, the scanner processes only infrequently crack the top 20. Moved to tmpfs, the amount of overall disk I/Os drop by at least half and traffic to the root devices drops to about what you'd expect for normal security- and audit-logging activities. New replies are no longer allowed. 63M af4793ac6c6b016e654f502a44e39544e9459ada650fd25d460f3905d14a149b 496M a2bc956d174f1e84becea809d036a932cd96e434f886eea6fb23abf50ec31b44 Plus, it's good when you want to compare benchmark versions (useful when you've implemented newer hardenings than your organization's scanners might be using). shm 64M 0 64M 0% /var/lib/docker/containers/dc32e0e4788b2e55d3402e4892fe4dfab7a1abd9fe57ccf0420dba8a0161f44c/mounts/shm tmpfs 395M 0 395M 0% /run/user/1001 I for one still recommend separating out the volatile filesystems and protecting root. That is one example of many. root@ubuntu2:/var/lib/docker# du -sch * |grep G The IPs will be different, Id have to setup a new host, and even if I did all that, nginx would be completely off Im pretty sure this would be even-more confusing. Its my biggest partition. Do I need to rebuild? It falls back to sorting by highest score if no posts are trending. Just make sure that if you use tmpfs for /tmp that you set an appropriate "size=" option. Chi squared test with reasonable sample size results in R warning. 69M b27f41aad77212892adb20dc017c30e1bd8eecbb9946b53ccc3ff3024842ee27 I started reaching for different tools and packages to slim down disk usage. tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup I have what some may deem as excessive partitioning, but I've discovered if I don't the server can be abused, example, I always made a /var/lib/docker for rhel 7 systems because too many customers would dog-pile their data under /var/lib until the server bleeds badly. udev 1.9G 0 1.9G 0% /dev Never mind the whole hardlinks in /tmp implying a permanence that's inconsistent with the reason for having /tmp in the first place. 4.3G total shm 64M 0 64M 0% /var/lib/docker/containers/4455c99beb21d04cf4daa42fdcf8494e65e419556a56ce9f99fbf6f06f054f93/mounts/shm 1.3G usr Another example, Tomcat content is often in /var/lib so sometimes we have needed a separate partition so tomcat is not contending for space with it's contents. That is, configuring Discourse to use another drive for the high storage requirement items like the database, file/image uploads, backups, etc? Anything missing or need correcting? I use tmpfs when possible, but when not I use a separate filesystem. overlay 14G 11G 2.4G 83% /var/lib/docker/overlay2/bb3fcf5eb730f23c40d8a60013c99c8844be6cdb37b8b98f67c01ac1b531b4cd/merged Thus, in your case the occupied capacity for /var/lib/docker should be even less than the 4.3G you got as a result. At this point I turned to docker and deleted all of the images with `docker rmi -f. This didn't help either. If you fill up /var (versus a /var that is part of /), things that require files to be written to /tmp are not affected. and want to have the best for its system. Is there anything a dual bevel mitre saw can do that a table saw can not? a 30 GB server using 10GB for OS and app leaves 20 GB free for the various possibles, whereas giving 5GB each to /tmp /var/tmp /var/tmp/audit /var/log and 10GB to /home (for those killer ISOs) just doubled your server disk and lowered your security buffer from 20 GB to 5GB in most cases. 45M 25b0685b563abc88d75df2ee4c0a79f16d685a7c700a38742d2f37041df9794d From what you said, no I don't think sooo, but that kind of depends on what you've observed. Most DPR (Damage Per Round) Barbarian Build against Undead. tmpfs 2.0G 0 2.0G 0% /dev/shm 76M 406d8b08ebf15218cecdb8d1198490a22e7baff351e7c8acaf794641bb4089be If nothing else, this has convinced me that Linux A/V is just as horrid as it was last time I touched it. 74M a7e8d2b4a5513cd20335a34918503fe98e2e9dc94ea85abefc0cfe14bc1d8f7c And Tom Jones' point about complying with security principles is quite salient. I do my best to make my user(application eng/developers) put all their stuff in a different volume, including their logs. But nothing ever goes wrong in engineering, and all factors are always vetted prior to deployment, right??? du: cannot access proc/8079/fd/3: No such file or directory Wow! 438M 84f3ebcb60fef50685a6f4dd4bfcf718f90f3e033c3c7ea5f7249adda07134ac Software vendor installers extracting to, and executing installers from there /dev/mapper/ubuntu2vg-root 14G 7.0G 6.1G 54% / Yes, there are situations separate filesystems pay off but for most cases, monitoring and a good buffer fits the bill: catch it before it happens. The problem however remained. There is no #howto for this as of now, added on my list to look into it and write one. Files in /home are certainly not sysadmin's job to clean up. Running df -h and baobab again with root priviledges gave me slightly different results. 47M 4ace76a6fe7f7861bdeb6065b02062ba24b3531d04e6f16edbca906ee08658b6 /dev/vdb1 20G 45M 19G 1% /mnt/backup Make sure the directory is not used anymore: Prepare directories and mount the new volume: Dont forget to add /dev/sdx8 to /etc/fstab. You have the various logging happening to /var/log/. It's also accountability. 2.4G home To me it appears pretty unbelievable that Docker would need this amount of vast disk space just for later being able to pull an image again. While we use monitoring (one customer uses zenoss, for example), and it is wonderful to inform the appropriate teams to take action, sometimes things fall in the cracks. tmpfs 2.0G 0 2.0G 0% /dev/shm Running Debian 9.1 stable on a dedicated machine. Presumably, some of this pain could possibly be addressed through better exclude list capabilities. Had the nice side-benefit of also reducing pressure on our ESX-serving SAN arrays. 2. ", Absolutely I would say it's more likely that a full rootfs would cause a panic than a full var. 469). 2.0M 5aac1b8ce1c15e518e428a848cd87f78ef9149fbb443661a2daa0a08ef3414f5 Lets see what @codinghorror and @techAPJ will come up with. How to further investigate. Here is another docker forum post that talks about the overlay and storage issues that docker has. Making statements based on opinion; back them up with references or personal experience. Disk full, du tells different. If it breaks some basic understanding like this I've been known to show vendor application engineers to the door. How to copy Docker images from one host to another without using a repository. 17M d898f5c8682a09641d33a63ae300aa22b5ccbd2385cc49226da5868d3d2da9fd :D. One of those times I post something like: I still strongly stand by the statements made before. If following the above guide, as a semi-newb, let me know if I got this right: Then maybe stop/start again? Doesn't seem to support stackable or client-specific rule-sets. 74M ed2cc633dcfd09fbe9807f9e9c3167c2379d14889da78f868a64bcbde6771136 Again, we wholeheartedly support and use monitoring of one form or another. Docker seems to use my /root partition which is only 20 GB and the rest of my 2TB drive is on /home. I work in an organization that run the entire spectrum from "everything on /" to separating out /var /var/db /var/log /var/cache /tmp, and a few I'm not remembering. If you're building ephemeral systems, if the disk fills up and the system falls over, your fault-detector nukes the system and rebuilds it (that's assuming it lives long enough to fill up). shm 64M 0 64M 0% /var/lib/docker/containers/916d2e317dec8d821c1605e331c1c8c2e48a081bee61c322a812ee3f9d7c86d1/mounts/shm The /tmp as tmpfs makes the symptoms of the A/Vs activities mostly disappear. Worth noting that vaulted.io also makes available common benchmarks and requires no registration to access. 73M 2f014d9ae6feaba4bc587d7b500de1e63fcc2952350341219ebcb5fd71bc916d I think a sensitive application that comes to a screeching halt may inturn cause a kernel panaic. To answer the people who asked about standard and consensus on disk layout, I strongly encorage you to look up CIS benchmark. How to use jq to return information to the shell, taking whitespace into account? Some additional advantages of a separate /var I fear however that this will not be a permanent solutions and that the problem will come back, but this will hopefully last another year. But i did not delete any files. h) Inode management in file systems. Everything worked out fine. root@ubuntu2:/# man du Our practice is to isolate /var/tmp & /var/log to independent LVs. I quiclky ran df -h and saw that my 20G root partition had less than 1G of available space. 7.0M 21b7cecc4db99ed1d2b7876f01dc3c6322820bbe49f1128008ca0ffd17b16916 David above has good things to say and I agree with pretty much everything. Filesystem Size Used Avail Use% Mounted on Getting paid by mistake after leaving a company? Some file systems, like ext3 and ext4, require that sysadmin defines inode numbers BEFORE creation of the file systems. About to try this on a fresh install. So, it was pushed out pell-mell. shm 64M 0 64M 0% /var/lib/docker/containers/53b44210516166800112fc9a3381f87efa1d7f2cb3f0d19c90165c32b8f3b587/mounts/shm Like I pointed out in my earlier response: your du messurement was and still is wrong. 154M bb3fcf5eb730f23c40d8a60013c99c8844be6cdb37b8b98f67c01ac1b531b4cd shm 64M 0 64M 0% /var/lib/docker/containers/dc32e0e4788b2e55d3402e4892fe4dfab7a1abd9fe57ccf0420dba8a0161f44c/mounts/shm How to further investigate?. No problem: this past year, we were forced to roll out McAfee's product onto every system. If you don't know it, you should. How did you separate it? and became a problem, particularly on systems that do a lot of disk I/Os. The fact this thing is even hitting tmp is a bit of a concern and appreciate your summary and details of workaround. 711M d4330d0d3bcee040588d204a8391761d87c56bd5ad6b6a8f3fac0c48fd0c51ce "Is there some additional risk to / filling that I haven't observed?". Is it possible to return a rental car in a different country? Note: if your users/tenants are used to being able to keep stuff in /tmp forever, there will be whining. Interested to know what performance benefits this is giving you specifically? There's no amount of 'I told you so' that makes it ok. Err That application is beyond badly designed. root@ubuntu2:/# In critical environments, those rules saved me lot of times. How well will your system fare with a null /etc/passwd or /etc/shadow, or how about /etc/pam.d/system-auth-ac. Always want OS and app-data on separate devices. These issues came up soon after I started playing around with docker. In fact, when I do health checks of any Linux server (I wrote a script to do it before and after any change is made, or simply to check status of servers). 7.0G total, Powered by Discourse, best viewed with JavaScript enabled. Why the definition of bilinearity property is different in cryptography compared to mathematics? Also means you can set different newfs options to better support a given file-allocation pattern (generally more beneficial to bitmapped filesystems than extent-based filesystems). especially "easier on your virtual infrastructure", I can understand moving the filesystem off disk will reduce iops on the underlying disk, but I haven't seen a scenario where /tmp usage produces any significant IO is this a byproduct of your antivirus software specifically (eg. How does JWST position itself to see and resolve an exact target? Let's try this, run docker info and check what is your storage driver: If it is not overlay2 (as appears above) try switching to it, and then prune docker images again and check if that cleaned up that folder. Recently I've been having storage issues in the root partitions of both my desktop and laptop computers. External hard drive not working after unplugging while Windows Explorer wasn't responding. root@ubuntu2:/# du -xsch * | grep G I think we lose focus of how many things throw files in temp locations, until we run out of space ;-). Restart docker daemon (or entire machine): Remove the /var/lib/docker directory entirely. If you have run the docker images, you need to make sure the images are unmounted totally. Though, in my (limited) experience filling /, I haven't witnessed this - I have found references to this occuring in years long past in kernel and OS versions long out of use. How to copy files from host to Docker container? I have not seen a system panic from a full rootfs in quite a while. Does satellite obviate this? Here are the images that I removed from my desktop: Here's the storage profile before I started remove docker-related files: After I removed the docker images, here is the same command: I found a helpful serverfault question from 6 years ago that address the issue I was having titled Disk full, du tells different. The df o/p is misleading since its showing different overlay2 directories. This stuff is messy, I recommend you create a test droplet and try it out there, its the easiest way to answer all questions with zero risk.

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