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开源软件名称（OpenSource Name）：upyun/lua-resty-checkups开源软件地址(OpenSource Url)：https://github.com/upyun/lua-resty-checkups开源编程语言(OpenSource Language)：Lua 95.8%开源软件介绍(OpenSource Introduction)：Namelua-resty-checkups - Manage Nginx upstreams in pure ngx_lua Table of ContentsStatusProbably production ready in most cases, though not yet proven in the wild. Please check the issues list and let me know if you have any problems / questions. Features
Installation$ luarocks install lua-resty-checkups
$ opm get upyun/lua-resty-checkups
Just tweeks the Compatibility
Synopsis -- config.lua
_M = {}
_M.global = {
checkup_timer_interval = 15,
checkup_shd_sync_enable = true,
shd_config_timer_interval = 1,
}
_M.ups1 = {
cluster = {
{
servers = {
{ host = "127.0.0.1", port = 4444, weight=10, max_fails=3, fail_timeout=10 },
}
},
},
}
return _M -- nginx.conf
lua_package_path "/path/to/lua-resty-checkups/lib/?.lua;/path/to/config.lua;;";
lua_shared_dict state 10m;
lua_shared_dict mutex 1m;
lua_shared_dict locks 1m;
lua_shared_dict config 10m;
server {
listen 12350;
return 200 12350;
}
server {
listen 12351;
return 200 12351;
}
init_by_lua_block {
local config = require "config"
local checkups = require "resty.checkups.api"
checkups.init(config)
}
init_worker_by_lua_block {
local config = require "config"
local checkups = require "resty.checkups.api"
checkups.prepare_checker(config)
checkups.create_checker()
}
server {
location = /12350 {
proxy_pass http://127.0.0.1:12350/;
}
location = /12351 {
proxy_pass http://127.0.0.1:12351/;
}
location = /t {
content_by_lua_block {
local checkups = require "resty.checkups.api"
local callback = function(host, port)
local res = ngx.location.capture("/" .. port)
ngx.say(res.body)
return 1
end
local ok, err
-- connect to a dead server, no upstream available
ok, err = checkups.ready_ok("ups1", callback)
if err then ngx.say(err) end
-- add server to ups1
ok, err = checkups.update_upstream("ups1", {
{
servers = {
{ host = "127.0.0.1", port = 12350, weight=10, max_fails=3, fail_timeout=10 },
}
},
})
if err then ngx.say(err) end
ngx.sleep(1)
ok, err = checkups.ready_ok("ups1", callback)
if err then ngx.say(err) end
ok, err = checkups.ready_ok("ups1", callback)
if err then ngx.say(err) end
-- add server to new upstream
ok, err = checkups.update_upstream("ups2", {
{
servers = {
{ host="127.0.0.1", port=12351 },
}
},
})
if err then ngx.say(err) end
ngx.sleep(1)
ok, err = checkups.ready_ok("ups2", callback)
if err then ngx.say(err) end
-- add server to ups2, reset rr state
ok, err = checkups.update_upstream("ups2", {
{
servers = {
{ host = "127.0.0.1", port = 12350, weight=10, max_fails=3, fail_timeout=10 },
{ host = "127.0.0.1", port = 12351, weight=10, max_fails=3, fail_timeout=10 },
}
},
})
if err then ngx.say(err) end
ngx.sleep(1)
ok, err = checkups.ready_ok("ups2", callback)
if err then ngx.say(err) end
ok, err = checkups.ready_ok("ups2", callback)
if err then ngx.say(err) end
}
}
}A typical output of the ConfigurationLua configurationConfiguration file of checkups is a lua module consists of two parts, the global part and the cluster part. An example configuration file of checkups is shown below, -- config.lua
-- Here is the global part
_M = {}
_M.global = {
checkup_timer_interval = 15,
checkup_timer_overtime = 60,
default_heartbeat_enable = true,
checkup_shd_sync_enable = true,
shd_config_timer_interval = 1,
}
-- The rests parts are cluster configurations
_M.redis = {
enable = true,
typ = "redis",
timeout = 2,
read_timeout = 15,
send_timeout = 15,
protected = true,
cluster = {
{ -- level 1
try = 2,
servers = {
{ host = "192.168.0.1", port = 6379, weight=10, max_fails=3, fail_timeout=10 },
{ host = "192.168.0.2", port = 6379, weight=10, max_fails=3, fail_timeout=10 },
}
},
{ -- level 2
servers = {
{ host = "192.168.0.3", port = 6379, weight=10, max_fails=3, fail_timeout=10 },
}
},
},
}
_M.api = {
enable = false,
typ = "http",
http_opts = {
query = "GET /status HTTP/1.1\r\nHost: localhost\r\n\r\n",
statuses = {
["500"] = false,
["502"] = false,
["503"] = false,
["504"] = false,
},
},
mode = "hash",
cluster = {
dc1 = {
servers = {
{ host = "192.168.1.1", port = 1234, weight=10, max_fails=3, fail_timeout=10 },
}
},
dc2 = {
servers = {
{ host = "192.168.1.2", port = 1234, weight=10, max_fails=3, fail_timeout=10 },
}
}
}
}
_M.ups_from_nginx = {
timeout = 2,
cluster = {
{ -- level 1
upstream = "api.com",
},
{ -- level 2
upstream = "api.com",
upstream_only_backup = true,
},
},
}
return _Mglobal configurations
Cluster configurations
Nginx configurationAdd pathes of lua config file and checkups to If you use stream subsystem, you should put these lines into API
initsyntax: init(config) phase: init_by_lua Copy upstreams from prepare_checkersyntax: prepare_checker(config) phase: init_worker_by_lua Copy configurations from create_checkersyntax: create_checker() phase: init_worker_by_lua Create heartbeat timer and upstream sync timer. Only one heartbeat timer will be created among all the workers. It's highly recommended to call this method in ready_oksyntax: res, err = ready_ok(skey, callback, opts?) phase: rewrite_by_lua*, access_by_lua*, content_by_lua*, ngx.timer.* Select an available The
Returns what If select_peersyntax: peer, err = select_peer(skey) context: rewrite_by_lua*, access_by_lua*, content_by_lua*, balancer_by_lua Select an available peer from cluster Return a table containing In case of errors, returns nil with a string describing the error. get_statussyntax: status = get_status() phase: rewrite_by_lua*, access_by_lua*, content_by_lua*, ngx.timer.* Return checkups status in get_ups_timeoutsyntax: connect_timeout, send_timeout, read_timeout = get_ups_timeout(skey) phase: rewrite_by_lua*, access_by_lua*, content_by_lua*, ngx.timer.* Return timeout of cluster feedback_statussyntax: ok, err = feedback_status(skey, host, port, failed) context: rewrite_by_lua*, access_by_lua*, content_by_lua*, ngx.timer.*, balancer_by_lua.* Mark server Returns update_upstreamsyntax: ok, err = update_upstream(skey, upstream) phase: rewrite_by_lua*, access_by_lua*, content_by_lua*, ngx.timer.* Update cluster Returns delete_upstreamsyntax: ok, err = delete_upstream(skey) phase: rewrite_by_lua*, access_by_lua*, content_by_lua*, ngx.timer.* Delete cluster Returns Copyright and LicenseThe bundle itself is licensed under the 2-clause BSD license. Copyright (c) 2016, UPYUN(又拍云) Inc. This module is licensed under the terms of the BSD license. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. See Also
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