我的设置：我有 3 台几乎相同的网络服务器机器，为相同的高负载动态网站提供简单的 dns 负载平衡。该服务已经使用相同的 apache 配置运行了两年多：apache2、php5、ubuntu 8.04 linux 2.6.24-29-server。
我的问题：大约两周前我遇到了这个配置的问题。几乎每天我都会有一个小时刻，大约 5 分钟，网站无法访问。我仍然可以通过 ssh 登录到服务器。如果我运行htop，我会看到机器什么也不做。我有大约 1000 个 apache 进程在运行，但没有 CPU 活动。
我已经使用 apache mod_status 来调试这种情况。流程记分板如下所示：
_C.___K_______________________R._______.__K_K____K___C_______.__
_______C__________.___________________________________.________C
_.____K__________K___K_WK_____._K_____________________________._
W______K__________K________.____________________._______C_______
_C_.__K__K____.._.._____________________________________C_______
_R___________K___.______C________.C_________.______._____C______
____________KKC____K_____K__WC_________________C_____.__.____.__
_____________________C_________K______.____C______._____________
_.___C____.___.___________________________.K______.____K________
W__.___________________C.__.____K________K_______R_._.__._______
__C__C_.__________C__C_______._____W______________C_.___C_______
____.______C_____________C________.____C____________.________._K
__.__________.K_____________K_________._____C____.K__________KW_
__K.W________R_________._______.___W___________.____.__K_____W__
W___.___..________W____K
Scoreboard Key:
"_" Waiting for Connection, "S" Starting up, "R" Reading Request,
"W" Sending Reply, "K" Keepalive (read), "D" DNS Lookup,
"C" Closing connection, "L" Logging, "G" Gracefully finishing,
"I" Idle cleanup of worker, "." Open slot with …