Apache Global Configuration

Apache MPM (multi-processing modul) Common Directives

Apache Architecture

StartServers- No of Child Server Process created when starting Apache.

- As the number of processes is dynamically controlled depending on the load, there is usually little reason to adjust this parameter.

Minimum Spare Servers

- Minimum no of Child Server Process will remain exist even Apache got nothing to do (idle)

- Tuning of this parameter should only be necessary on very busy sites

Maximum Spare Servers

- Maximum no of Child Server Process will remain exist even Apache got nothing to do (idle)

- Tuning of this parameter should only be necessary on very busy sites

Max Clients

- The MaxClients directive sets the limit on the number of simultaneous requests that will be served

- Any connection attempts over the MaxClients limit will normally be queued

- Once a child process is freed at the end of a different request, the connection will then be serviced.

ServerLimit- This directive sets

the maximum configured value for MaxClients for the lifetime of the Apache process.

- If ServerLimit is set to a value much higher than necessary, extra, unused shared memory will be allocated

- Highly recommend using the default setting unless you fully understand how it will interact with your Apache build and MaxClients setting.

MaxRequestsPerChild- The

MaxRequestsPerChild directive sets the limit on the number of requests that an individual child server process will handle.

- After MaxRequestsPerChild requests, the child process will die.

- If MaxRequestsPerChild is 0, then the process will never expire.

Keep-Alive Timeout- The number of

seconds Apache will wait for a subsequent request before closing the connection.

- Once a request has been received, the timeout value specified by the Timeout directive applies.

Max Keep-Alive Requests- The

MaxKeepAliveRequests directive limits the number of requests allowed per connection when KeepAlive is on.

- If it is set to 0, unlimited requests will be allowed.

- Its recommend that this setting be kept to a high value for maximum server performance.

Timeout- Amount of time the

server will wait for certain events before failing a request

- Example:- In mod_cgi, the

length of time to wait for output from a CGI script

- When reading data from the client, the length of time to wait for a TCP packet to arrive if the read buffer is empty