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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. 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. But chances are, that Pi is writing lots and lots of log files.
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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.
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