MongoDB日志切换（Rotate Log Files）方法及注意事项
MongoDB日志切换（Rotate Log Files）方法及注意事项转载自：http://duoyun.org/topic/512047a5cd0cc40a0a04c381
MongoDB日志默认不会切换，生产系统尤其是压力大的系统，日志滚动速度非常快，我们上线系统最大的一个mongod进程的log每天增长5G多。目前采取策略是每天切换一次，保存一周的日志。
目前采取的方法：
· SIGUSR1 方法
killall -SIGUSR1 mongod
每天0点定时执行来达切换日志。
大部分情况下并无问题，但近期集中出现了两台服务器日志切换时出现问题，0点到0点20分左右，日志是空的。mongod 或者config报警，进程重启（自动），该bug至少要到2.5.x才修复。MongoDB的稳定性目前确实不尽人意。
· 采取mongo shell logRotate 来避免该bug
use admin
db.runCommand( { logRotate : 1 } )
此方法需要在mongos,mongod,config server运行，不能一次性切换所有日志。
logRotate命令也有‘bug’，这两天出现了两次（版本2.2.2）：
Sat May 4 00:01:02 ERROR: Failed to rename /export/data/mongodb/log/mongod.log to /export/data/mongodb/log/mongod.log.2013-05-03T16-01-02 Fatal Assertion 16175
0xaffd31 0xac5323 0x70f4f1 0x6e8d71 0x6ea5e2 0x6eb59c 0x832c68 0x8363b0 0x7b072d 0x7b3a53 0x5703f2 0xaedfc1 0x32ad2077f1 0x32acee570d
/export/servers/mongodb/bin/mongod(_ZN5mongo15printStackTraceERSo+0x21)
/export/servers/mongodb/bin/mongod(_ZN5mongo13fassertFailedEi+0xa3)
/export/servers/mongodb/bin/mongod()
/export/servers/mongodb/bin/mongod(_ZN5mongo12_execCommandEPNS_7CommandERK***NS_7BSONObjEiRNS_14BSONObjBuilderEb+0x51)
/export/servers/mongodb/bin/mongod(_ZN5mongo11execCommandEPNS_7CommandERNS_6ClientEiPKcRNS_7BSONObjERNS_14BSONObjBuilderEb+0xd52)
/export/servers/mongodb/bin/mongod(_ZN5mongo12_runCommandsEPKcRNS_7BSONObjERNS_11_BufBuilderINS_16TrivialAllocatorEEERNS_14BSONObjBuilderEbi+0x2ac)
/export/servers/mongodb/bin/mongod(_ZN5mongo11runCommandsEPKcRNS_7BSONObjERNS_5CurOpERNS_11_BufBuilderINS_16TrivialAllocatorEEERNS_14BSONObjBuilderEbi+0x38)
/export/servers/mongodb/bin/mongod(_ZN5mongo8runQueryERNS_7MessageERNS_12QueryMessageERNS_5CurOpES1_+0xc10)
/export/servers/mongodb/bin/mongod()
/export/servers/mongodb/bin/mongod(_ZN5mongo16assembleResponseERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortE+0x3a3)
/export/servers/mongodb/bin/mongod(_ZN5mongo16MyMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortEPNS_9LastErrorE+0x82)
/export/servers/mongodb/bin/mongod(_ZN5mongo3pms9threadRunEPNS_13MessagingPortE+0x411)
/lib64/libpthread.so.0()
/lib64/libc.so.6(clone+0x6d)
Sat May 4 00:01:02
***aborting after fassert() failure
Sat May 4 00:01:02 Got signal: 6 (Aborted).
Sat May 4 00:01:02 Backtrace:
0xaffd31 0x558bb9 0x32ace32900 0x32ace32885 0x32ace34065 0xac535e 0x70f4f1 0x6e8d71 0x6ea5e2 0x6eb59c 0x832c68 0x8363b0 0x7b072d 0x7b3a53 0x5703f2 0xaedfc1 0x32ad2077f1 0x32acee570d
/export/servers/mongodb/bin/mongod(_ZN5mongo15printStackTraceERSo+0x21)
/export/servers/mongodb/bin/mongod(_ZN5mongo10abruptQuitEi+0x399)
/lib64/libc.so.6()
/lib64/libc.so.6(gsignal+0x35)
/lib64/libc.so.6(abort+0x175)
/export/servers/mongodb/bin/mongod(_ZN5mongo13fassertFailedEi+0xde)
/export/servers/mongodb/bin/mongod()
/export/servers/mongodb/bin/mongod(_ZN5mongo12_execCommandEPNS_7CommandERK***NS_7BSONObjEiRNS_14BSONObjBuilderEb+0x51)
/export/servers/mongodb/bin/mongod(_ZN5mongo11execCommandEPNS_7CommandERNS_6ClientEiPKcRNS_7BSONObjERNS_14BSONObjBuilderEb+0xd52)
/export/servers/mongodb/bin/mongod(_ZN5mongo12_runCommandsEPKcRNS_7BSONObjERNS_11_BufBuilderINS_16TrivialAllocatorEEERNS_14BSONObjBuilderEbi+0x2ac)
/export/servers/mongodb/bin/mongod(_ZN5mongo11runCommandsEPKcRNS_7BSONObjERNS_5CurOpERNS_11_BufBuilderINS_16TrivialAllocatorEEERNS_14BSONObjBuilderEbi+0x38)
/export/servers/mongodb/bin/mongod(_ZN5mongo8runQueryERNS_7MessageERNS_12QueryMessageERNS_5CurOpES1_+0xc10)
/export/servers/mongodb/bin/mongod()
/export/servers/mongodb/bin/mongod(_ZN5mongo16assembleResponseERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortE+0x3a3)
/export/servers/mongodb/bin/mongod(_ZN5mongo16MyMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortEPNS_9LastErrorE+0x82)
/export/servers/mongodb/bin/mongod(_ZN5mongo3pms9threadRunEPNS_13MessagingPortE+0x411)
/lib64/libpthread.so.0()
/lib64/libc.so.6(clone+0x6d)
对应源码：
class LogRotateCmd : public Command {
public:
LogRotateCmd() : Command( "logRotate" ) {}
virtual LockType locktype() const { return NONE; }
virtual bool slaveOk() const { return true; }
virtual bool adminOnly() const { return true; }
virtual bool run(const string& ns, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool fromRepl) {
fassert(16175, rotateLogs());
return 1;
}
} logRotateCmd;
rotateLogs()返回结果不对。
bool rotateLogs() {
return loggingManager.rotate();
}
rotateLogs()->rotate()
bool rotate() {
if ( ! _enabled ) {
cout
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