Ruediger Pluem wrote:
On 26.07.2006 18:11, Jean-frederic Clere wrote:
Hi,
I have started to write a "generic" health-checker for mod_proxy. I
would like to change the macro PROXY_WORKER_IS_USABLE() to a routine in
proxy_util.c.
Comments?
From my current point of view we should keep this macro as a simple bit checker.
+1 to your efforts writing a "generic" health-checker to mod_proxy. Do you use
a provider approach to implement it?
Yes. I have attached a draft of the include I plan to use.
That would make it possible to reimplement
Mladen's cping_cpong for AJP as a provider.
I already have a prototype of an external health checker process that
uses an AJP cping/cpong and a simple connect for http/https.
Basicaly mod_proxy uses the health_worker_method routine to write and
read from a slot mem that contains the information of the workers + a
health information. A balancer could check the health information before
using the worker. The health checker process uses the worker description
(thru the health_worker_method) to check if the back-end service is running.
Then we would have a very flexible
way to plugin different health-checks.
Yep
Cheers
Jean-Frederic
Regards
Rüdiger
/* To store the configuration of the balancers and workers.
*/
struct proxy_balancer_conf {
char name[32];
char sticky[32];
int sticky_force;
apr_interval_time_t timeout;
int max_attempts;
char max_attempts_set;
char lbmethod_name[32];
};
struct proxy_worker_conf {
proxy_worker_stat httpstatus; /* httpd private */
char balancer_name[32];
int id; /* scoreboard id */
apr_interval_time_t retry; /* retry interval */
int lbfactor; /* initial load balancing factor */
char name[32];
char scheme[6]; /* scheme to use ajp|http|https */
char hostname[32]; /* remote backend address */
char route[128]; /* balancing route */
char redirect[128]; /* temporary balancing redirection route */
int status; /* temporary worker status */
apr_port_t port;
int min; /* Desired minimum number of available connections */
int smax; /* Soft maximum on the total number of connections */
int hmax; /* Hard maximum on the total number of connections */
apr_interval_time_t ttl; /* maximum amount of time in seconds a connection
* may be available while exceeding the soft limit */
apr_interval_time_t timeout; /* connection timeout */
char timeout_set;
apr_interval_time_t acquire; /* acquire timeout when the maximum number of connections is exceeded */
char acquire_set;
apr_size_t recv_buffer_size;
char recv_buffer_size_set;
apr_size_t io_buffer_size;
char io_buffer_size_set;
char keepalive;
char keepalive_set;
int is_address_reusable;
int flush_packets;
int flush_wait; /* poll wait time in microseconds if flush_auto */
int health;
};
