解决 systemd-journald: Failed to write entry 问题
遇到一台CentOS 7.x的服务器异常，通过dmesg看到有大量刷屏如下信息刷屏：（可能长期持续甚至会导致宕机）。
[ 445.509296] systemd-journald[13720]: Failed to write entry (15 items, 350 bytes), ignoring: Cannot assign requested address
[ 451.494537] systemd-journald[13720]: Failed to write entry (19 items, 505 bytes), ignoring: Cannot assign requested address
[ 451.506036] systemd-journald[13720]: Failed to write entry (19 items, 505 bytes), ignoring: Cannot assign requested address
[ 451.517485] systemd-journald[13720]: Failed to write entry (19 items, 545 bytes), ignoring: Cannot assign requested address单独重启了systemd-journald服务也没有用，网上找了一会有了方案，最后解决了。
从这个错误来看就是，journald写日志错误。
通过 journalctl --verify 命令找到损坏的journal文件，然后删除或者mv移动它，再重启systemd-journald服务即可。
$sudo journalctl --verify
bf258: Invalid object
File corruption detected at /var/log/journal/21fbd9cf5ebc4d1ea8e83b6f1be17eaf/system.journal:13bf258 (of 25165824 bytes, 82%).
FAIL: /var/log/journal/21fbd9cf5ebc4d1ea8e83b6f1be17eaf/system.journal (Cannot assign requested address)
PASS: /run/log/journal/111bd9cf5ebc4d1ea8e83b6f1b132433/system.journal重启systemd-journald服务。
sudo systemctl restart systemd-journald.service解决后，通过dmesg查看信息，有如下信息，然后也没有再继续打印“Failed to write entry”的错误了。
[ 451.550833] systemd-journald[13720]: Failed to write entry (19 items, 534 bytes), ignoring: Cannot assign requested address
[ 452.086954] systemd-journald[13720]: Failed to write entry (21 items, 664 bytes), ignoring: Cannot assign requested address
[ 452.098319] systemd-journald[13720]: /var/log/journal/21fbd9cf5ebc4d1ea8e83b6f1be17eaf/system.journal: Journal file has been deleted, rotating.
[ 456.087325] systemd-journald[13720]: Received SIGTERM from PID 1 (systemd).
参考文档：
https://www.claudiokuenzler.com/blog/627/systemd-journald-stopped-logging-centos-7-failed-to-write-entry#.Wn2G74KYPOQ
https://bugzilla.redhat.com/show_bug.cgi?id=1292447
Original article: 解决 systemd-journald: Failed to write entry 问题
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