[ETC] address already in use error

ETC

포스트 작성을 위해 hexo server로 프로세스로 돌고있던 터미널을 강제로 종료했습니다.
이후 hexo server를 실행하려 하는데 address already in use 에러가 발생했습니다.

간단히 이 에러를 해결해봅시다.

에러 전문은 아래와 같습니다.

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% hexo server
AL Port 4000 has been used. Try other port instead.
FATAL Something's wrong. Maybe you can find the solution here: https://hexo.io/docs/troubleshooting.html
Error: listen EADDRINUSE: address already in use :::4000
    at Server.setupListenHandle [as _listen2] (net.js:1309:16)
    at listenInCluster (net.js:1357:12)
    at Server.listen (net.js:1445:7)
    at /Users/devsawd/blog/node_modules/hexo-server/lib/server.js:69:12
    at Promise._execute (/Users/devsawd/blog/node_modules/bluebird/js/release/debuggability.js:384:9)
    at Promise._resolveFromExecutor (/Users/devsawd/blog/node_modules/bluebird/js/release/promise.js:518:18)
    at new Promise (/Users/devsawd/blog/node_modules/bluebird/js/release/promise.js:103:10)
    at checkPort (/Users/devsawd/blog/node_modules/hexo-server/lib/server.js:66:10)
    at Hexo.module.exports (/Users/devsawd/blog/node_modules/hexo-server/lib/server.js:18:10)
    at Hexo.tryCatcher (/Users/devsawd/blog/node_modules/bluebird/js/release/util.js:16:23)
    at Hexo.<anonymous> (/Users/devsawd/blog/node_modules/bluebird/js/release/method.js:15:34)
    at /Users/devsawd/blog/node_modules/hexo/lib/hexo/index.js:248:17
    at Promise._execute (/Users/devsawd/blog/node_modules/bluebird/js/release/debuggability.js:384:9)
    at Promise._resolveFromExecutor (/Users/devsawd/blog/node_modules/bluebird/js/release/promise.js:518:18)
    at new Promise (/Users/devsawd/blog/node_modules/bluebird/js/release/promise.js:103:10)
    at Hexo.call (/Users/devsawd/blog/node_modules/hexo/lib/hexo/index.js:244:12)
    at /usr/local/lib/node_modules/hexo-cli/lib/hexo.js:67:17
    at tryCatcher (/usr/local/lib/node_modules/hexo-cli/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/usr/local/lib/node_modules/hexo-cli/node_modules/bluebird/js/release/promise.js:547:31)
    at Promise._settlePromise (/usr/local/lib/node_modules/hexo-cli/node_modules/bluebird/js/release/promise.js:604:18)
    at Promise._settlePromise0 (/usr/local/lib/node_modules/hexo-cli/node_modules/bluebird/js/release/promise.js:649:10)
    at Promise._settlePromises (/usr/local/lib/node_modules/hexo-cli/node_modules/bluebird/js/release/promise.js:729:18)

에러 내용은 4000번 포트가 이미 사용되고 있다는겁니다.
4000번 포트를 사용중인 프로세스를 먼저 찾아봐야겠네요.

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% lsof -i :4000
COMMAND   PID    USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
node    43609 devsawd   42u  IPv6 0x1a23ef236800be15      0t0  TCP *:terabase (LISTEN)

PID의 43609번이 사용중으로 확인됩니다.
kill 명령어로 해당 프로세스를 종료시킨 후

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%  kill -9 43609
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%  hexo server

hexo server 명령어를 이용해 재구동 하니 정상적으로 사용할 수 있습니다.

address already in use에러는 port를 사용하는 프로세스를 다룰때 자주 볼 수 있는 에러입니다.
간단히 해당 프로세스를 종료시켜 문제를 해결할 수 있습니다.

HEXO
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