In zram-config it works with a /etc/ztab where zswap, zdir and a zlog can be defined. I would have a look at as to be honest there is a lot with log2ram I don’t like. Looking to build a community around so any ideas or issues please post away and get involved as claim no ownership just annoyed me so many utils for this application are flawed. You can create any number of zswaps and zdir and a zlog via /etc/ztab, multiple zswap always bemuses me as zram has been multi-steam since kernel 3.15 but hey if you want more than one you can. The utility also does zswap and also includes important sys-admin config of mem-limit and tuning parameters of swapiness and page-cache as zram is not HDD like media its a mem technology with near memcpy speed. Large directories can be used in extremely small zram memory footprint because zram is the upper in a OverlayFS mount of the original readonly in lower. It also doesn’t copy every complete file that has change on every hour as this is pointless really as if you have a system crash and the write of stop isn’t accomplished the critical info up to the last hour is lost anyway.īut any directory can be configured with zram-config and because of the OverlayFS no copy of all files is needed on boot. It also uses the logrotate directive of olddir so logrotate ships oldlogs to persistant rather than choke precious memory. Due to the nature of copy-up of COW only writes are in zram and this massively reduces memory footprint. Zram-config uses zram in a OverlayFS upper with the original read only in the lower. Log2Ram does some strange things and works with an extremely tight ram allocation.
![raspberry pi light logger raspberry pi light logger](https://www.raspberrypi-spy.co.uk/wp-content/uploads/2015/10/templogger2_01.jpg)
I use it on a directory basis for zlog and zdir.ĭoes zswap, zdir and zlog in one utility. OverlayFS is a great idea there are a copy of examples that mount the whole system in OverlayFS lower and Ram upper. Posted in Linux Hacks, Raspberry Pi Tagged /var/log, cron, flash, linux, logging, mount, ram, raspberry pi, sd card, shell script, wear-leveling Post navigation It goes back quite a way, so settle in for some good binge reading. If you need more information on such things, check out Linux-Fu series. One thing we really like about ’s project is that it’s a great example of shell scripting and Linux admin concepts. There’s still a chance to lose logging data before it’s swept to disk, but if you have relatively stable system it’s a small price to pay for the long-term health of a Pi that’s out of sight and out of mind. Every hour, a cron job sweeps the virtual logs out to the SD card, greatly reducing its wear. The idea is that any application or service sending log entries to /var/log will actually be writing them to virtual log files, which won’t rack up any activity on the SD card. His “Log2Ram” is a simple Unix shell script that sets up a mount point for logging in RAM rather than on the SD card. The problem is that flash memory segments wear out after a fairly low number of erase cycles, and the SD card’s wear-leveling algorithm will eventually cordon off enough of the card to cause file system issues. has a neat way to avoid SD card logging issues on Raspberry Pi, he calls it a solution to reduce “thrashing” of the SD card. Logging is good - it helps when tracking down issues - but uncontrolled logging can lead to problems down the road with the Pi’s SD card.
![raspberry pi light logger raspberry pi light logger](https://jartweb.net/blog/wp-content/uploads/2013/04/RPi.jpg)
But chances are, that Pi is writing lots and lots of log files. Most of us seem to have at least one Pi tucked away somewhere, running a Magic Mirror, driving security cameras, or even taking care of a media library. The fragility of SD cards is the weak link in the Raspberry Pi ecosystem.