[tmpfs var/log] mount /var/log as tmpfs for some platforms (#2780)
SONiC is a heavy writer to /var/log partition, we noticed that this behavior causes certain flash drive to become read-only over time. To avoid this issue, we mount /var/log parition on these devices as tmpfs. - Mount /var/log as tmpfs - /var/log default size is 128M - Adjust size according to existing var-log.ext4 file size. - Adjust size to between 5% to 10% of total memory size. Signed-off-by: Ying Xie <ying.xie@microsoft.com>
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@ -11,6 +11,31 @@ case $1 in
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;;
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esac
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set_tmpfs_log_partition_size()
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{
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varlogsize=128
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# NOTE: certain platforms, when reaching initramfs stage, have a small
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# limit of mounting tmpfs partition, potentially due to amount
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# of RAM available in this stage. e.g. Arista 7050 QX32
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[ X"$aboot_platform" = X"x86_64-arista_7050_qx32" ] && return
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# set varlogsize to existing var-log.ext4 size
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if [ -f ${rootmnt}/host/disk-img/var-log.ext4 ]; then
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varlogsize=$(ls -l ${rootmnt}/host/disk-img/var-log.ext4 | awk '{print $5}')
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varlogsize=$(($varlogsize/1024/1024))
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fi
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# make sure varlogsize is between 5% to 10% of total memory size
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memkb=$(grep MemTotal /proc/meminfo | awk '{print $2}')
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memmb=$(($memkb/1024))
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minsize=$(($memmb*5/100))
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maxsize=$(($memmb*10/100))
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[ $minsize -ge $varlogsize ] && varlogsize=$minsize
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[ $maxsize -le $varlogsize ] && varlogsize=$maxsize
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}
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## Mount the overlay file system: rw layer over squashfs
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image_dir=$(cat /proc/cmdline | sed -e 's/.*loop=\(\S*\)\/.*/\1/')
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mkdir -p ${rootmnt}/host/$image_dir/rw
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@ -26,5 +51,16 @@ mount --bind ${rootmnt}/host/$image_dir/{{ DOCKERFS_DIR }} ${rootmnt}/var/lib/do
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## Mount the boot directory in the raw partition, bypass the overlay
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mkdir -p ${rootmnt}/boot
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mount --bind ${rootmnt}/host/$image_dir/boot ${rootmnt}/boot
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## Mount loop device for /var/log
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## Mount loop device or tmpfs for /var/log
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onie_platform=""
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aboot_platform=""
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. ${rootmnt}/host/machine.conf
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if [ X"$aboot_platform" = X"x86_64-arista_7050_qx32" ] ||
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[ X"$aboot_platform" = X"x86_64-arista_7050_qx32s" ]
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then
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set_tmpfs_log_partition_size
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mount -t tmpfs -o rw,nosuid,nodev,size=${varlogsize}M tmpfs ${rootmnt}/var/log
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[ -f ${rootmnt}/host/disk-img/var-log.ext4 ] && rm -rf ${rootmnt}/host/disk-img/var-log.ext4
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else
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[ -f ${rootmnt}/host/disk-img/var-log.ext4 ] && mount -t ext4 -o loop,rw ${rootmnt}/host/disk-img/var-log.ext4 ${rootmnt}/var/log
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fi
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