Hi all, This is an interesting one.
I'm trying to have haproxy send requests to 4 backends which are redis servers. Only one of the four is master, and the other 3 are slaves. I want to health check by sending an INFO command, to which redis will reply $640 redis_version:1.3.15 redis_git_sha1:00000000 redis_git_dirty:0 arch_bits:32 multiplexing_api:select process_id:9987 uptime_in_seconds:1201116 uptime_in_days:13 connected_clients:1 connected_slaves:3 blocked_clients:0 used_memory:372250520 used_memory_human:355.01M changes_since_last_save:58 bgsave_in_progress:0 last_save_time:1315567163 bgrewriteaof_in_progress:0 total_connections_received:1888418 total_commands_processed:2587074 expired_keys:0 hash_max_zipmap_entries:64 hash_max_zipmap_value:512 pubsub_channels:0 pubsub_patterns:0 vm_enabled:0 role:master db0:keys=2228970,expires=0 db1:keys=41,expires=0 If the response from the check includes the reply "role:master", I want the health check to succeed, else fail. I'm finding this really hard to do with haproxy. I have listen redis localhost:6379 mode tcp option tcplog log global balance roundrobin option httpchk INFO \r\n http-check expect rstring master server redis1 192.168.0.1:6379 maxconn 30 check inter 30s server redis2 192.168.0.2:6379 maxconn 30 check inter 30s backup etc But the health check is failing with [WARNING] 251/123821 (8241) : Server redis/redis1 is DOWN, reason: Layer7 invalid response, info: "$640", check duration: 25ms. 3 active and 0 backup servers left. 0 sessions active, 0 requeued, 0 remaining in queue. I know I'm trying to do something odd with httpchk, and perhaps I need to craft a better regexp for my expect string. Could anyone assist? Kind Regards john -- John Helliwell
