Mongrel无法启动解决方案

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mongrel

mongrel

如果使用Mongrel来部署Rails,就不可避免的使用

mongrel_rails start -C mongrel.config

这里mongrel.config是mongrel的配置文件,可以为:

—
:config_script:
:environment: development
:pid_file: log/mongrel.pid
:num_processors: 1024
:docroot: public
:timeout: 0
:host: 0.0 . 0.0
:mime_map:
:port: 3000
:daemon: false
:cwd: /home/linux/projects/mongrel/testapp
:includes:
- mongrel
:debug: false
:log_file: log/mongrel.log

然后到app的根目录下运行上述的命令,恭喜您,你启动成功了.
但是有个问题,如果我不在app的根目录下运行呢?系统会给出我们信息:

!!! Path to log file not valid: log/mongrel.log
mongrel::start reported an error. Use mongrel_rails mongrel::start -h to get help.

第一眼看见这个错误,觉得非常简单,Mongrels的创始人给出的答案是将相对路径改为绝对路径.
也许上述的方法能解决问题,但是我相信仍然有一种情况:即使改为绝对路径,还是出现同样的错误.
如果发生上述的错误应该怎么办?
不幸的是,上述的问题我已经碰见过,很长时间不得要领.文档看破皮了,还是不能运行.不得已,打开mongrels的源代码看看.最后发现需要指定工作目录,因为工作目录是在log之前验证的.
摘录一段代码:

ruby 代码

module Mongrel
class Start < GemPlugin::Plugin "/commands"
include Mongrel::Command::Base
def configure
options [
["-e" , "--environment ENV" , "Rails environment to run as" , : @environment , ENV['RAILS_ENV'] || "development" ],
["-d" , "--daemonize" , "Run daemonized in the background" , : @daemon , false ],
['-p', '--port PORT', "Which port to bind to" , : @port , 3000],
['-a', '--address ADDR', "Address to bind to" , : @address , "0.0.0.0" ],
['-l', '--log FILE', "Where to write log messages" , : @log_file , "log/mongrel.log" ],
['-P', '--pid FILE', "Where to write the PID" , : @pid_file , "log/mongrel.pid" ],
['-n', '--num-procs INT', "Number of processors active before clients denied" , : @num_procs , 1024],
['-t', '--timeout TIME', "Timeout all requests after 100th seconds time" , : @timeout , 0],
['-m', '--mime PATH', "A YAML file that lists additional MIME types" , : @mime_map , nil ],
['-c', '--chdir PATH', "Change to dir before starting (will be expanded)" , : @cwd , Dir .pwd],
['-r', '--root PATH', "Set the document root (default 'public')" , : @docroot , "public" ],
['-B', '--debug', "Enable debugging mode" , : @debug , false ],
['-C', '--config PATH', "Use a config file" , : @config_file , nil ],
['-S', '--script PATH', "Load the given file as an extra config script" , : @config_script , nil ],
['-G', '--generate PATH', "Generate a config file for use with -C" , : @generate , nil ],
['' , '--user USER', "User to run as" , : @user , nil ],
['' , '--group GROUP', "Group to run as" , : @group , nil ],
['' , '--prefix PATH', "URL prefix for Rails app" , : @prefix , nil ]
]
end
def validate
@cwd = File .expand_path( @cwd )
valid_dir? @cwd , "Invalid path to change to during daemon mode: #@cwd"
# Change there to start, then we’ll have to come back after daemonize
Dir .chdir( @cwd )
valid?(@prefix [0].chr == "/" && @prefix [-1].chr != "/" , "Prefix must begin with / and not end in /" ) if @prefix
valid_dir? File .dirname( @log_file ), "Path to log file not valid: #@log_file"
valid_dir? File .dirname( @pid_file ), "Path to pid file not valid: #@pid_file"
valid_dir? @docroot , "Path to docroot not valid: #@docroot"
valid_exists? @mime_map , "MIME mapping file does not exist: #@mime_map" if @mime_map
valid_exists? @config_file , "Config file not there: #@config_file" if @config_file
valid_dir? File .dirname( @generate ), "Problem accessing directory to #@generate" if @generate
valid_user? @user if @user
valid_group? @group if @group
return @valid
end
def run
# Config file settings will override command line settings
settings = { :host => @address , :port => @port , :cwd => @cwd ,
:log_file => @log_file , :pid_file => @pid_file , :environment => @environment ,
:docroot => @docroot , :mime_map => @mime_map , :daemon => @daemon ,
:debug => @debug , :includes => [ "mongrel" ], :config_script => @config_script ,
:num_processors => @num_procs , :timeout => @timeout ,
:user => @user , :group => @group , :prefix => @prefix , :config_file => @config_file
}
#……
if @config_file
settings.merge! YAML.load_file(@config_file )
STDERR.puts "** Loading settings from #{@config_file} (they override command line)." unless settings[ :daemon ]
end
config = Mongrel::Rails::RailsConfigurator.new (settings) do
if defaults[ :daemon ]
if File .exist? defaults[ :pid_file ]
log "!!! PID file #{defaults[:pid_file]} already exists. Mongrel could be running already. Check your #{defaults[:log_file]} for errors."
log "!!! Exiting with error. You must stop mongrel and clear the .pid before I’ll attempt a start."
exit 1
end
daemonize
log "Daemonized, any open files are closed. Look at #{defaults[:pid_file]} and #{defaults[:log_file]} for info."
log "Settings loaded from #{@config_file} (they override command line)." if @config_file
end

看看上面的代码就非常清楚了.
那么如何解决,可以这样:

mongrel_rails start -c youapp/path/to -C mongrel.config

这样就OK了.

扩展应用:可以配置为服务自动启动.

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