On Mon, Nov 26, 2018 at 09:50:57AM -0800, Omar Sandoval wrote: > > Hey, Ted, sorry, I meant to ask you about this in person at LPC but > forgot to. Forgive my ignorance about syslog, but does syslog not pick > up the line we write to dmesg?
Unfortunately, it does not. root@xfstests-ltm:~# echo foo testing >> /dev/kmsg root@xfstests-ltm:~# dmesg | tail [ 7.103899] random: crng init done [ 7.104759] random: 7 urandom warning(s) missed due to ratelimiting [ 7.154525] EDAC MC: Ver: 3.0.0 [ 7.221973] EDAC sbridge: Seeking for: PCI ID 8086:2fa0 [ 7.221977] EDAC sbridge: Ver: 1.1.1 [ 7.259154] device-mapper: uevent: version 1.0.3 [ 7.267252] device-mapper: ioctl: 4.35.0-ioctl (2016-06-23) initialised: [email protected] [ 7.762306] EXT4-fs (sda1): resizing filesystem from 2620928 to 13106683 blocks [ 8.541258] EXT4-fs (sda1): resized filesystem to 13106683 [840160.646340] foo testing root@xfstests-ltm:~# tail /var/log/kern.log root@xfstests-ltm:~# grep kern.log /etc/rsyslog.conf kern.* -/var/log/kern.log So as you can see nothing written to kern.log, even though we wrote to /dev/kmsg. To prove that kern.log will get kernel messages: root@xfstests-ltm:~# mke2fs -t ext4 -Fq /tmp/foo.img 8M root@xfstests-ltm:~# mount -t ext4 /tmp/foo.img /mnt root@xfstests-ltm:~# echo testing > /sys/fs/ext4/loop0/trigger_fs_error root@xfstests-ltm:~# tail /var/log/kern.log Nov 26 13:30:22 xfstests-ltm kernel: [840286.728296] loop: module loaded Nov 26 13:30:22 xfstests-ltm kernel: [840286.752181] EXT4-fs (loop0): mounted filesystem with ordered data mode. Opts: (null) Nov 26 13:30:41 xfstests-ltm kernel: [840305.773418] EXT4-fs error (device loop0): trigger_test_error:123: comm bash: testing root@xfstests-ltm:~# - Ted
