如何保證你的小應用長生不死？

美好的願望

通常我們在部署spring-boot應用的時候， 總希望應用能夠好好活著。 即使出現了內存溢出或者被別人把應用給殺死了， 也希望應用能夠快速自動重新啟動起來。 下面就介紹一款能滿足我們需求的小工具。

Supervisor

官方地址： http://www.supervisord.org/

安裝

這裡我們介紹比較方便的一種安裝方式 pip 安裝。 因為Supervisor不支持Python3，因此需要在Python2的環境下進行安裝。

pip install supervisor

安裝完畢後，可以通過下面的命令來查看和創建配置文件

查看配置文件，順便看看是否安裝成功了

echo_supervisord_conf

配置

配置文件中有很多項目我一般比較關心下面的幾項

file=/tmp/supervisor.sock ; the path to the socket file 建議修改logfile=/tmp/supervisord.log ; main log file; default $CWD/supervisord.log 建議修改pidfile=/tmp/supervisord.pid ; supervisord pidfile; default supervisord.pid 建議修改serverurl=unix:///tmp/supervisor.sock ; use a unix:// URL for a unix socket 建議修改, 位置如上設定;files = relative/directory/*.ini 建議修改，並解消注釋

建議把我們的配置都歸納到一個文件夾，方便進行統一的管理

# 想知道Mac下面這個樹如何生成的？先安裝一個查看目錄樹的小工具 brew install tree# rest.gehui.com.ini 是我們的一個應用的配置，稍後介紹supervisor├── conf│ └── rest.gehui.com.ini├── logs├── start.sh├── supervisorctl.sh├── supervisord.ini└── temp

這裡面的幾個文件的詳情

start.sh

#!/bin/sh/usr/local/bin/supervisord -c "/Users/gehui/work/supervisor/supervisord.ini"

supervisorctl.sh

#!/bin/sh/usr/local/bin/supervisorctl -c "/Users/gehui/work/supervisor/supervisord.ini" $@

supervisord.ini

; 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=/Users/gehui/work/supervisor/temp/supervisor.sock ; the path to the socket file 自定義;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 defaultport=127.0.0.1:9001 ; ip_address:port specifier, *:port for all ifaceusername=admin ; default is no username (open server) 自定義password=Passw0rd ; default is no password (open server) 自定義[supervisord]logfile=/Users/gehui/work/supervisor/logs/supervisord.log ; main log file; default $CWD/supervisord.log 自定義logfile_maxbytes=50MB ; max main logfile bytes b4 rotation; default 50MBlogfile_backups=10 ; # of main logfile backups; 0 means none, default 10loglevel=info ; log level; default info; others: debug,warn,tracepidfile=/Users/gehui/work/supervisor/temp/supervisord.pid ; supervisord pidfile; default supervisord.pid 自定義nodaemon=false ; start in foreground if true; default falseminfds=1024 ; min. avail startup file descriptors; default 1024minprocs=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 ; dont 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:///Users/gehui/work/supervisor/temp/supervisor.sock ; use a unix:// URL for a unix socket 自定義serverurl=http://127.0.0.1:9001 ; use an http:// url to specify an inet socket 自定義;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 (reqd);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 = /Users/gehui/work/supervisor/conf/*.ini ; 自定義

創建spring-boot應用

# 不妨先複習一下shellmkdir -p /Users/gehui/work/rest.gehui.com# 應用結構如下rest.gehui.com├── bin│ └── rest.gehui.com-1.0.jar├── logs├── start.sh└── temp

啟動文件 start.sh

#!/bin/bashBASE_DIR=/Users/gehui/work/rest.gehui.comBUILD_NAME=1.0exec /Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/bin/java -Dfile.encoding=UTF-8 -Xmx128m -XX:+UseG1GC -XX:MaxGCPauseMillis=100 -XX:InitiatingHeapOccupancyPercent=35 -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+PrintGCApplicationStoppedTime -Xloggc:${BASE_DIR}/logs/jvm_gc.log -XX:ErrorFile=${BASE_DIR}/logs/jvm_err.log -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=${BASE_DIR}/logs/jvm_dump_pid%p.hprof -jar ${BASE_DIR}/bin/rest.gehui.com-${BUILD_NAME}.jar # --spring.profiles.active=production

運行一下看看～

chmod 775 start.sh# 執行一下看看./start.sh# 換個iTerm tab試試效果，搞定！curl "http://localhost:8080/greeting"{"id":1,"content":"Hello, World!"}%

配置應用管理

如上文提到的，創建一個我們的spring-boot服務配置文件：

rest.gehui.com.ini

[program:rest.gehui.com]command=/Users/gehui/work/rest.gehui.com/start.sh ; 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=/Users/gehui/work/rest.gehui.com ; 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=user_00 ; setuid to this UNIX account to run the programredirect_stderr=true ; redirect proc stderr to stdout (default false)stdout_logfile=/Users/gehui/work/rest.gehui.com/logs/supervisord-std.log ; stdout log path, NONE for none; default AUTOstdout_logfile_maxbytes=10MB ; 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=/Users/gehui/work/rest.gehui.com/logs/supervisord-stderr.log ; stderr log path, NONE for none; default AUTO;;stderr_logfile_maxbytes=10MB ; 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)

啟動我們的Supervisor

# 注意設置一下shell腳本的執行許可權cd /Users/gehui/work/supervisor./start.sh

啟動完服務的埠號為：127.0.0.1:9001，看看服務的狀態

./supervisorctl.sh statusrest.gehui.com RUNNING pid 11434, uptime 0:00:05

也可以登錄 http://127.0.0.1:9001/ 來查看狀態，管理頁面比較簡單易懂，在此不再贅述。

看看應用是否能夠訪問

curl "http://localhost:8080/greeting"{"id":1,"content":"Hello, World!"}%# 殺死他kill -9 11434# 再看看curl "http://localhost:8080/greeting"curl: (7) Failed to connect to localhost port 8080: Connection refused# 馬上再看一次，又自動活過來了～curl "http://localhost:8080/greeting"{"id":1,"content":"Hello, World!"}%

成功！