Supervisord 是用 Python 实现的一款非常实用的进程管理工具，supervisord 还要求管理的程序是非 daemon 程序，supervisord 会帮你把它转成 daemon 程序，因此如果用 supervisord 来管理 nginx 的话，必须在 nginx 的配置文件里添加一行设置 daemon off 让 nginx 以非 daemon 方式启动。Supervisor 用来管理linux的服务确实是一个不错的工具。
安装
[root@xiexianbin_cn ~]# pip install supervisor
Requirement already satisfied: supervisor in /usr/lib/python2.7/site-packages/supervisor-3.3.3-py2.7.egg
Requirement already satisfied: meld3>=0.6.5 in /usr/lib/python2.7/site-packages/meld3-1.0.2-py2.7.egg (from supervisor)
supervisor 配置
输出到文件：
[root@xiexianbin_cn ~]# echo_supervisord_conf > /etc/supervisord.conf
配置内容：
[root@xiexianbin_cn ~]# echo_supervisord_conf
; Sample supervisor config file.
;
; For more information on the config file, please see:
; http://supervisord.org/configuration.html
;
; Notes:
; - Shell expansion ("~" or "$HOME") is not supported. Environment
; variables can be expanded using this syntax: "%(ENV_HOME)s".
; - Quotes around values are not supported, except in the case of
; the environment= options as shown below.
; - Comments must have a leading space: "a=b ;comment" not "a=b;comment".
; - Command will be truncated if it looks like a config file comment, e.g.
; "command=bash -c 'foo ; bar'" will truncate to "command=bash -c 'foo ".
[unix_http_server]
file=/tmp/supervisor.sock ; the path to the socket file
;chmod=0700 ; socket file mode (default 0700)
;chown=nobody:nogroup ; socket file uid:gid owner
;username=user ; default is no username (open server)
;password=123 ; default is no password (open server)
;[inet_http_server] ; inet (TCP) server disabled by default
;port=127.0.0.1:9001 ; ip_address:port specifier, *:port for all iface
;username=user ; default is no username (open server)
;password=123 ; default is no password (open server)
[supervisord]
logfile=/tmp/supervisord.log ; main log file; default $CWD/supervisord.log
logfile_maxbytes=50MB ; max main logfile bytes b4 rotation; default 50MB
logfile_backups=10 ; # of main logfile backups; 0 means none, default 10
loglevel=info ; log level; default info; others: debug,warn,trace
pidfile=/tmp/supervisord.pid ; supervisord pidfile; default supervisord.pid
nodaemon=false ; start in foreground if true; default false
minfds=1024 ; min. avail startup file descriptors; default 1024
minprocs=200 ; min. avail process descriptors;default 200
;umask=022 ; process file creation umask; default 022
;user=chrism ; default is current user, required if root
;identifier=supervisor ; supervisord identifier, default is 'supervisor'
;directory=/tmp ; default is not to cd during start
;nocleanup=true ; don't clean up tempfiles at start; default false
;childlogdir=/tmp ; 'AUTO' child log dir, default $TEMP
;environment=KEY="value" ; key value pairs to add to environment
;strip_ansi=false ; strip ansi escape codes in logs; def. false
; The rpcinterface:supervisor section must remain in the config file for
; RPC (supervisorctl/web interface) to work. Additional interfaces may be
; added by defining them in separate [rpcinterface:x] sections.
[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
; The supervisorctl section configures how supervisorctl will connect to
; supervisord. configure it match the settings in either the unix_http_server
; or inet_http_server section.
[supervisorctl]
serverurl=unix:///tmp/supervisor.sock ; use a unix:// URL for a unix socket
;serverurl=http://127.0.0.1:9001 ; use an http:// url to specify an inet socket
;username=chris ; should be same as in [*_http_server] if set
;password=123 ; should be same as in [*_http_server] if set
;prompt=mysupervisor ; cmd line prompt (default "supervisor")
;history_file=~/.sc_history ; use readline history if available
; The sample program section below shows all possible program subsection values.
; Create one or more 'real' program: sections to be able to control them under
; supervisor.
;[program:theprogramname]
;command=/bin/cat ; the program (relative uses PATH, can take args)
;process_name=%(program_name)s ; process_name expr (default %(program_name)s)
;numprocs=1 ; number of processes copies to start (def 1)
;directory=/tmp ; directory to cwd to before exec (def no cwd)
;umask=022 ; umask for process (default None)
;priority=999 ; the relative start priority (default 999)
;autostart=true ; start at supervisord start (default: true)
;startsecs=1 ; # of secs prog must stay up to be running (def. 1)
;startretries=3 ; max # of serial start failures when starting (default 3)
;autorestart=unexpected ; when to restart if exited after running (def: unexpected)
;exitcodes=0,2 ; 'expected' exit codes used with autorestart (default 0,2)
;stopsignal=QUIT ; signal used to kill process (default TERM)
;stopwaitsecs=10 ; max num secs to wait b4 SIGKILL (default 10)
;stopasgroup=false ; send stop signal to the UNIX process group (default false)
;killasgroup=false ; SIGKILL the UNIX process group (def false)
;user=chrism ; setuid to this UNIX account to run the program
;redirect_stderr=true ; redirect proc stderr to stdout (default false)
;stdout_logfile=/a/path ; stdout log path, NONE for none; default AUTO
;stdout_logfile_maxbytes=1MB ; max # logfile bytes b4 rotation (default 50MB)
;stdout_logfile_backups=10 ; # of stdout logfile backups (0 means none, default 10)
;stdout_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0)
;stdout_events_enabled=false ; emit events on stdout writes (default false)
;stderr_logfile=/a/path ; stderr log path, NONE for none; default AUTO
;stderr_logfile_maxbytes=1MB ; max # logfile bytes b4 rotation (default 50MB)
;stderr_logfile_backups=10 ; # of stderr logfile backups (0 means none, default 10)
;stderr_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0)
;stderr_events_enabled=false ; emit events on stderr writes (default false)
;environment=A="1",B="2" ; process environment additions (def no adds)
;serverurl=AUTO ; override serverurl computation (childutils)
; The sample eventlistener section below shows all possible eventlistener
; subsection values. Create one or more 'real' eventlistener: sections to be
; able to handle event notifications sent by supervisord.
;[eventlistener:theeventlistenername]
;command=/bin/eventlistener ; the program (relative uses PATH, can take args)
;process_name=%(program_name)s ; process_name expr (default %(program_name)s)
;numprocs=1 ; number of processes copies to start (def 1)
;events=EVENT ; event notif. types to subscribe to (req'd)
;buffer_size=10 ; event buffer queue size (default 10)
;directory=/tmp ; directory to cwd to before exec (def no cwd)
;umask=022 ; umask for process (default None)
;priority=-1 ; the relative start priority (default -1)
;autostart=true ; start at supervisord start (default: true)
;startsecs=1 ; # of secs prog must stay up to be running (def. 1)
;startretries=3 ; max # of serial start failures when starting (default 3)
;autorestart=unexpected ; autorestart if exited after running (def: unexpected)
;exitcodes=0,2 ; 'expected' exit codes used with autorestart (default 0,2)
;stopsignal=QUIT ; signal used to kill process (default TERM)
;stopwaitsecs=10 ; max num secs to wait b4 SIGKILL (default 10)
;stopasgroup=false ; send stop signal to the UNIX process group (default false)
;killasgroup=false ; SIGKILL the UNIX process group (def false)
;user=chrism ; setuid to this UNIX account to run the program
;redirect_stderr=false ; redirect_stderr=true is not allowed for eventlisteners
;stdout_logfile=/a/path ; stdout log path, NONE for none; default AUTO
;stdout_logfile_maxbytes=1MB ; max # logfile bytes b4 rotation (default 50MB)
;stdout_logfile_backups=10 ; # of stdout logfile backups (0 means none, default 10)
;stdout_events_enabled=false ; emit events on stdout writes (default false)
;stderr_logfile=/a/path ; stderr log path, NONE for none; default AUTO
;stderr_logfile_maxbytes=1MB ; max # logfile bytes b4 rotation (default 50MB)
;stderr_logfile_backups=10 ; # of stderr logfile backups (0 means none, default 10)
;stderr_events_enabled=false ; emit events on stderr writes (default false)
;environment=A="1",B="2" ; process environment additions
;serverurl=AUTO ; override serverurl computation (childutils)
; The sample group section below shows all possible group values. Create one
; or more 'real' group: sections to create "heterogeneous" process groups.
;[group:thegroupname]
;programs=progname1,progname2 ; each refers to 'x' in [program:x] definitions
;priority=999 ; the relative start priority (default 999)
; The [include] section can just contain the "files" setting. This
; setting can list multiple files (separated by whitespace or
; newlines). It can also contain wildcards. The filenames are
; interpreted as relative to this file. Included files *cannot*
; include files themselves.
;[include]
;files = relative/directory/*.ini
修改配置
/etc/supervisord.conf
[include]
files = /etc/supervisord.conf.d/*.conf
新建管理的应用
cd /etc/supervisord.conf.d
vim app1.conf
配置文件：
[program:app1]
directory = /opt/app/app1
command = /opt/app/app1/app1
autostart = true
startsecs = 5
user = root
redirect_stderr = true
stdout_logfile = /var/log/supervisord/app1.log
启动 supervisord
手动启动方式
[root@xiexianbin_cn ~]# supervisord
/usr/lib/python2.7/site-packages/supervisor-3.3.3-py2.7.egg/supervisor/options.py:298: UserWarning: Supervisord is running as root and it is searching for its configuration file in default locations (including its current working directory); you probably want to specify a "-c" argument specifying an absolute path to a configuration file for improved security.
'Supervisord is running as root and it is searching '
[root@xiexianbin_cn ~]#
python env 启动方式
supervisord -c $ENV_PATH/etc/supervisor.conf
supervisord -c $ENV_PATH/etc/supervisor.conf --nodaemon
操作：
supervisorctl -c $ENV_PATH/etc/supervisor.conf start all
supervisorctl -c $ENV_PATH/etc/supervisor.conf start app_1
supervisorctl -c $ENV_PATH/etc/supervisor.conf stop app_1
supervisorctl -c $ENV_PATH/etc/supervisor.conf shutdown
supervisord 管理
Supervisord 安装完成后有两个可用的命令行 supervisord 和 supervisorctl，命令使用解释如下：
- supervisord，初始启动 Supervisord，启动、管理配置中设置的进程。
- supervisorctl stop programxxx，停止某一个进程(programxxx)，programxxx 为 [program:beepkg] 里配置的值，这个示例就是 beepkg。
- supervisorctl start programxxx，启动某个进程
- supervisorctl restart programxxx，重启某个进程
- supervisorctl stop groupworker: ，重启所有属于名为 groupworker 这个分组的进程(start,restart 同理)
- supervisorctl stop all，停止全部进程，注：start、restart、stop 都不会载入最新的配置文件。
- supervisorctl reload，载入最新的配置文件，停止原有进程并按新的配置启动、管理所有进程。
- supervisorctl update，根据最新的配置文件，启动新配置或有改动的进程，配置没有改动的进程不会受影响而重启。
注意：
- 显示用 stop 停止掉的进程，用 reload 或者 update 都不会自动重启。
配置开机启动
mkdir /etc/supervisord.conf.d/
cat /etc/supervisord.conf.d/supervisord.service
# supervisord service for systemd (CentOS 7.0+)
# by ET-CS (https://github.com/ET-CS)
[Unit]
Description=Supervisor daemon
[Service]
Type=forking
ExecStart=/usr/bin/supervisord
ExecStop=/usr/bin/supervisorctl $OPTIONS shutdown
ExecReload=/usr/bin/supervisorctl $OPTIONS reload
KillMode=process
Restart=on-failure
RestartSec=42s
[Install]
WantedBy=multi-user.target
开机启动：
systemctl enable /etc/supervisord.conf.d/supervisord.service
相关命令：
systemctl start supervisord.service
systemctl status supervisord.service
systemctl stop supervisord.service
重新加载配置
# supervisorctl reread
logstash: changed
logstash2: disappeared
# supervisorctl reload
Restarted supervisord
help 命令
[root@xiexianbin_cn ~]# supervisorctl --help
supervisorctl -- control applications run by supervisord from the cmd line.
Usage: /usr/bin/supervisorctl [options] [action [arguments]]
Options:
-c/--configuration FILENAME -- configuration file path (searches if not given)
-h/--help -- print usage message and exit
-i/--interactive -- start an interactive shell after executing commands
-s/--serverurl URL -- URL on which supervisord server is listening
(default "http://localhost:9001").
-u/--username USERNAME -- username to use for authentication with server
-p/--password PASSWORD -- password to use for authentication with server
-r/--history-file -- keep a readline history (if readline is available)
action [arguments] -- see below
Actions are commands like "tail" or "stop". If -i is specified or no action is
specified on the command line, a "shell" interpreting actions typed
interactively is started. Use the action "help" to find out about available
actions.
[root@xiexianbin_cn ~]#
配置示例
logstash-1
[program:logstash]
;command=/data/logstash/bin/logstash -f /etc/logstash/conf.d/nginx.conf --debug -l /var/log/logstash/nginx.log
command=/data/logstash/bin/logstash -f /etc/logstash/conf.d/nginx.conf --debug
numprocs=1
autostart=true
autorestart=true
log_stdout=true
log_stderr=true
stdout_logfile=/var/log/logstash/nginx.log
supervisorctl start/stop/restart logstash
logstash-2
[program:logstash_filebeatopenstack]
command=/data/logstash/bin/logstash -f /etc/logstash/conf.d/filebeatopenstack.conf --path.data /data/01/logstash/filebeatopenstack --http.port 9609 -b 1000 -w 8
directory=/data/logstash
autostart = true
autorestart = true
redirect_stderr = true
stdout_logfile=/var/log/logstash/filebeatopenstack.log
FAQ
uWSGI 配置
动态 worker 配置：
cheaper-algo = busyness
processes = 500 ; Maximum number of workers allowed
cheaper = 8 ; Minimum number of workers allowed
cheaper-initial = 16 ; Workers created at startup
cheaper-overload = 30 ; Length of a cycle in seconds
cheaper-step = 16 ; How many workers to spawn at a time
cheaper-busyness-multiplier = 30 ; How many cycles to wait before killing workers
cheaper-busyness-min = 20 ; Below this threshold, kill workers (if stable for multiplier cycles)
cheaper-busyness-max = 70 ; Above this threshold, spawn new workers
cheaper-busyness-backlog-alert = 16 ; Spawn emergency workers if more than this many requests are waiting in the queue
cheaper-busyness-backlog-step = 2 ; How many emergegency workers to create if there are too many requests in the queue
短时间内高并发的场景：优化时可以将 cheaper-algo 的busyness策略改成spare，意思是 cheaper-overload 30秒内没有负载的worker关闭，之前的 busyness 比较复杂，5*60秒内检查60次，如果平均busyness小于25%会停止一个worker