On Wed, 20 Jun 2012 10:36:17 +0200 Arno Gaboury <arnaud.gaboury@xxxxxxxxx> wrote: > Dear all, > > My /, /boot and /usr are on a BTRFS /(except /boot on ext2) on a ssd. > I want to add this line in my fstab to avoid too many writings on my ssd : > > *tmpfs /var/log tmpfs nodev,nosuid,noexec 0 0* > > So each time I reboot, my /var/log will be emptied, which could be a > problem in case of serious issue on my box. I was then thinking of a way > to backup this folder before I shutdown. I found this trick in the Arch > forum: > > add this in my */etc/rc.local.shutdown*: > > |*echo "Copying LOGs..." > > now=`date +"%Y%m%d_%Hh%M"` > mkdir -p /logs_backup/$now > cp -Rp /var/log/* ~/backup/logs_backup/$now/* > > My ~ folder is on another HD. > > Will this script be enough to do the job? > > TY for advising. > | > > Well, SSD's limited number of write cycles is largerly a myth these days (see www.toshiba.com/taec/news/media_resources/docs/SSDmyths.pdf). Of course it depends on your particular model/brand but practically, an SSD will most likely outlive your machine anyways. So I wouldn't worry about /var/log too much. However, optimizing log writes is a good idea even on an HDD. I think putting /var/log to RAM (as well as putting there firefox/thunderbird profiles) is stupid and is asking for trouble. A much better approach is to properly configure syslog-ng or rsyslog, specifically: 1. You don't have to write same log into messages.log, kernel.log etc... 2. If you have a univ. wifi with RADIUS, you most likely obtain lease every 15 min. this log (with level debug) goes into /var/log/dhcpcd.log. 3. Firewall logging is useful for network monitoring/debugging, but /var/log/iptables.log will grow huge on a public network. In cases 2 and 3 you can tell syslog to put the corresponding files into /tmp/log (I assume /tmp is already tmpfs) since this info is not really needed in the long term. -- Leonid Isaev GnuPG key: 0x164B5A6D Fingerprint: C0DF 20D0 C075 C3F1 E1BE 775A A7AE F6CB 164B 5A6D
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