1. Check Apache current concurrent connections:
netstat -an | grep ESTABLISHED | wc -l
Compare with the MaxClients value in httpd.conf to see the difference.
2. Check number of processes:
ps aux|grep httpd|wc -l
3. You can use the following parameters to view data
server-status?auto
#ps -ef|grep httpd|wc -l
1388
Counts the number of httpd processes. Each request starts one process, applicable to Apache servers.
Indicates that Apache can handle 1388 concurrent requests; this value can be automatically adjusted by Apache based on load.
#netstat -nat|grep -i "80"|wc -l
4341
netstat -an prints the system’s current network connection status, grep -i "80" extracts connections related to port 80, and wc -l counts the number of connections.
The final returned number is the total number of all current requests on port 80.
#netstat -na|grep ESTABLISHED|wc -l
376
netstat -an prints the system’s current network connection status, grep ESTABLISHED extracts established connection information, then wc -l does the counting.
The final returned number is the total number of all current established connections on port 80.
netstat -nat||grep ESTABLISHED|wc – Can view detailed records of all established connections
View Apache’s concurrent request count and TCP connection states:
Linux command:
netstat -n | awk '/^tcp/ {++S[$NF]} END {for（a in S） print a, S[a]}'
(This command was obtained from Wang, Technical Director of Sina Interactive Community Division. Very useful.) Sample output:
LAST_ACK 5
SYN_RECV 30
ESTABLISHED 1597
FIN_WAIT1 51
FIN_WAIT2 504
TIME_WAIT 1057
Where:
SYN_RECV indicates the number of requests waiting to be processed;
ESTABLISHED indicates normal data transmission state;
TIME_WAIT indicates requests that have completed processing and are waiting for timeout.
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Check httpd process count (i.e., the number of concurrent requests Apache can handle in prefork mode):
Linux command:
ps -ef | grep httpd | wc -l
View Apache’s concurrent request count and TCP connection states:
Linux command:
netstat -n | awk '/^tcp/ {++S[$NF]} END {for（a in S） print a, S[a]}'
Sample output:
LAST_ACK 5
SYN_RECV 30
ESTABLISHED 1597
FIN_WAIT1 51
FIN_WAIT2 504
TIME_WAIT 1057
Explanation:
SYN_RECV indicates the number of requests waiting to be processed;
ESTABLISHED indicates normal data transmission state;
TIME_WAIT indicates requests that have completed processing and are waiting for timeout.