My scanners have 16vcpus and 64 GB Ram allocated to them. (Each) I noticed that the clamd process actually began hanging on some of the scanners. This slowed the scanning by a lot. looking at the log, the only thing it says is “... sleep”. After 5-10 minutes it will continue, and then pause again.
Do you know how I can troubleshoot this issue? On Tue, Mar 2, 2021 at 9:40 AM G.W. Haywood via clamav-users < clamav-users@lists.clamav.net> wrote: > Hi there, > > On Tue, 2 Mar 2021, Michael Kyriacou via clamav-users wrote: > > On Tue, Mar 2, 2021 at 4:08 AM G.W. Haywood via clamav-users wrote: > >> On Mon, 1 Mar 2021, Michael Kyriacou via clamav-users wrote: > >> > >>> ... clamav 103.1 on ubuntu 20.04. I am getting “can’t allocate > >>> memory errors” on very large files ( 10GB +). I thought clamdscan > >>> was supposed to skip files that are larger than what you set the > >>> maxfilesize/maxscansize to. > >> > >> Unfortunately this is a known issue: > >> > >> https://bugzilla.clamav.net/show_bug.cgi?id=12374 > >> > >> Have you tried other ways to avoid scanning huge files? > > > > I was not aware of any other way to avoid scanning large files. Where > can I > > find such solutions? > > The operating system offers ways to avoid shooting your own feet. You > could just arrange for all the huge files to be in some corner of the > filesystem which you don't normally scan - which begs the questions > what are you scanning, and why? There will of course be pseudo-files > in your system which you should _never_ scan. The 'find' utility will > let you specify size limits. You will need to spend some quality time > with the 'man' pages to gain familiarity with using standard utilities > in conjunction with something like ClamAV. Using the 'man' pages is > something of an acquired taste, which you do need to acquire if you're > to get the most out of a Linux box. The 'man' page for clamd.conf > contains information about usage of resources. Also there are some > warnings, which to my mind are perhaps a little over the top, but they > serve to remind us that the system's resources may be shared between a > large number of processes; that these processes compete for resources; > and that things can get ugly when there aren't enough to go around. > > The concept of "not scanning a file larger than X bytes" is a bit too > simplistic when talking about scanning with something like ClamAV which > (a) depending on the file type may use different approaches to scanning > and (b) can extract the content from types of file (e.g. Zip, RAR, etc.) > which can contain whole directory structures and also employ compression > techniques, and which as a result are subject to various and sometimes > non-obvious Denial-Of-Service type attacks. So there are numerous clamd > configuration options which permit fine-tuning of the resource usage of > the ClamAV tools. To make the best use of these options you'll need to > be familiar with the your system's resources, and the constraints. > > How much memory does the box have? You'll probably need a gigabyte or > so to store the signature database before you even start a scan, plus > whatever the scanner uses when it scans something - that depends a lot > on what it's scanning. Then if you keep the default configuration to > permit scanning while reloading the databases, another gigabyte will > be used (briefly) every time clamd reloads the database. Note that > the extra memory will not be released until the completion of any scan > which was started before the reload. I'd recommend that if you don't > want to have to work on memory management, four gigabytes of RAM is > about the minimum for a clamd server. The longer it takes to scan a > file, the more likely it is that you'll try to reload the database > during a scan, so if you're short on memory and you want to scan files > which take a long time to scan then it's worth considering the option > to scan data only while a database reload is not taking place. > > -- > > 73, > Ged. > > _______________________________________________ > > clamav-users mailing list > clamav-users@lists.clamav.net > https://lists.clamav.net/mailman/listinfo/clamav-users > > > Help us build a comprehensive ClamAV guide: > https://github.com/vrtadmin/clamav-faq > > http://www.clamav.net/contact.html#ml >
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