https://bz.apache.org/bugzilla/show_bug.cgi?id=63933
Bug ID: 63933
Summary: CLOSE_WAITs using Apache httpd-2.4.27.1-64 mpm_worker
Product: Apache httpd-2
Version: 2.4.27
Hardware: All
OS: Linux
Status: NEW
Severity: major
Priority: P2
Component: All
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Hi Teaam,
We are using Apache httpd-2.4.27.1-64 as a reverse proxy on top of multiple
tomcat web applications servers, have a F5 Load Balancer in front of Apache.
Once in a while there are many sockets in CLOSE_WAITs(anywhere between 100 and
400, worst I have seen is >2000) that do not clear for more than 10-15 mins
causing an outage to the web applications.
During such a situation the RAM on the RHEL machine where Apache web server is
being run is > 100% committed.
I was using Apache httpd-2.2.31.1-64 earlier and upgraded to httpd-2.4.27.1-64
but the problem persists.
The number of worker processes is >30 usually when there are too many
CLOSE_WAITs.
Some key setting are as follows:
Timeout 300
KeepAlive On
MaxKeepAliveRequests 0
KeepAliveTimeout 5
Worker Module settings are as follows:
<IfModule mpm_worker_module>
ServerLimit 128
StartServers 10
MaxClients 4096
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 32
MaxRequestsPerChild 0
ListenBackLog 2048
</IfModule>
Apache is running on RHEL 2.6.32-754.23.1.el6.x86_64.
# ulimit -a -S
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 160660
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 160660
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
# ulimit -a -H
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 160660
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 4096
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) unlimited
cpu time (seconds, -t) unlimited
max user processes (-u) 160660
virtual memory (kbytes, -v) unlimited
Please see if there are any related bugs or any notes that I can refer that can
help solve the issue.
Thanks,
Santosh
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