De vez em quando, meu servidor rails para de responder. Eu crio os logs e não há nada - apenas um monte de pedidos que começaram a começar depois que o último foi concluído ...
Usando
- Ubuntu
- Puma 2.15.3
- Ruby 2.2.1p85
- NGINX 1.4.6
- Supervisor (para servidor running & respawning rails & sidekiq)
Registros de trilhos ...
Completed 200 OK in 179ms (Views: 6.2ms | ActiveRecord: 165.7ms)
Started OPTIONS "/api/v2/users/me" for 209.217.218.34 at 2015-12-16 21:43:47 +0000
Started OPTIONS "/api/v2/users/me" for 209.217.218.34 at 2015-12-16 21:44:21 +0000
Started GET "/" for 209.217.218.34 at 2015-12-16 21:45:11 +0000
Started GET "/" for 209.217.218.34 at 2015-12-16 21:45:27 +0000
Started GET "/" for 209.217.218.34 at 2015-12-16 21:48:13 +0000
Started OPTIONS "/api/v2/users/me" for 209.217.218.34 at 2015-12-16 21:49:19 +0000
Started GET "/" for 209.217.218.34 at 2015-12-16 22:11:58 +0000
Os registros do NGINX mostram o tempo de espera aparente ao ler o cabeçalho da resposta
2015/12/16 21:48:43 [error] 1129#0: *1777 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.217.218.34, server: example.com, request: "GET / HTTP/1.1", upstream: "http://unix:/example_site/shared/tmp/sockets/puma.staging.sock/", host: "example.com"
2015/12/16 21:49:49 [error] 1129#0: *1783 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.217.218.34, server: example.com, request: "OPTIONS /api/v2/users/me HTTP/1.1", upstream: "http://unix:/example_site/shared/tmp/sockets/puma.staging.sock/api/v2/users/me", host: "example.com", referrer: "http://example.com/"
2015/12/16 22:12:28 [error] 1129#0: *1785 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.217.218.34, server: example.com, request: "GET / HTTP/1.1", upstream: "http://unix:/example_site/shared/tmp/sockets/puma.staging.sock/", host: "example.com"
O proxy do servidor NGINX passa para um servidor puma, que tem 2 trabalhadores e 8 threads.
Eu executei um comando strace em um dos threads. E vi isso ...
[pid 32463] futex(0x7f0314c27a78, FUTEX_WAKE_PRIVATE, 1) = 0 <0.000042>
[pid 32463] clock_gettime(CLOCK_MONOTONIC, {454145, 535389460}) = 0 <0.000034>
[pid 32463] write(16, "p32428\n", 7) = 7 <0.000036>
[pid 32463] clock_gettime(CLOCK_MONOTONIC, {454145, 535541983}) = 0 <0.000013>
[pid 32463] clock_gettime(CLOCK_MONOTONIC, {454145, 535578664}) = 0 <0.000012>
[pid 32463] futex(0x7f0314c27a04, FUTEX_WAIT_BITSET_PRIVATE, 5195, {454150, 535578664}, ffffffff <unfinished ...>
[pid 32471] <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) <1.000163>
[pid 32471] futex(0x7f03148dc858, FUTEX_WAKE_PRIVATE, 1) = 0 <0.000010>
[pid 32471] clock_gettime(CLOCK_MONOTONIC, {454146, 119592840}) = 0 <0.000005>
[pid 32471] clock_gettime(CLOCK_MONOTONIC, {454146, 119637474}) = 0 <0.000006>
[pid 32471] clock_gettime(CLOCK_MONOTONIC, {454146, 119655894}) = 0 <0.000005>
[pid 32471] futex(0x7f03148dc7e4, FUTEX_WAIT_BITSET_PRIVATE, 25969, {454147, 119655894}, ffffffff <unfinished ...>
[pid 32470] <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) <1.000142>
[pid 32470] futex(0x7f0314dc94d8, FUTEX_WAKE_PRIVATE, 1) = 0 <0.000013>
[pid 32470] clock_gettime(CLOCK_MONOTONIC, {454146, 531287803}) = 0 <0.000006>
[pid 32470] clock_gettime(CLOCK_MONOTONIC, {454146, 531415055}) = 0 <0.000049>
[pid 32470] clock_gettime(CLOCK_MONOTONIC, {454146, 531502589}) = 0 <0.000037>
[pid 32470] futex(0x7f0314dc9464, FUTEX_WAIT_BITSET_PRIVATE, 25969, {454147, 531502589}, ffffffff <unfinished ...>
[pid 32471] <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) <1.000166>
[pid 32471] futex(0x7f03148dc858, FUTEX_WAKE_PRIVATE, 1) = 0 <0.000009>
[pid 32471] clock_gettime(CLOCK_MONOTONIC, {454147, 119925263}) = 0 <0.000005>
[pid 32471] clock_gettime(CLOCK_MONOTONIC, {454147, 119965172}) = 0 <0.000014>
[pid 32471] clock_gettime(CLOCK_MONOTONIC, {454147, 119996627}) = 0 <0.000005>
[pid 32471] futex(0x7f03148dc7e4, FUTEX_WAIT_BITSET_PRIVATE, 25971, {454148, 119996627}, ffffffff <unfinished ...>
[pid 32470] <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) <1.000142>
[pid 32470] futex(0x7f0314dc94d8, FUTEX_WAKE_PRIVATE, 1) = 0 <0.000046>
[pid 32470] clock_gettime(CLOCK_MONOTONIC, {454147, 531936925}) = 0 <0.000033>
[pid 32470] clock_gettime(CLOCK_MONOTONIC, {454147, 532077784}) = 0 <0.000042>
[pid 32470] clock_gettime(CLOCK_MONOTONIC, {454147, 532160473}) = 0 <0.000036>
[pid 32470] futex(0x7f0314dc9464, FUTEX_WAIT_BITSET_PRIVATE, 25971, {454148, 532160473}, ffffffff <unfinished ...>
[pid 32471] <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) <1.000143>
[pid 32471] futex(0x7f03148dc858, FUTEX_WAKE_PRIVATE, 1) = 0 <0.000010>
[pid 32471] clock_gettime(CLOCK_MONOTONIC, {454148, 120250641}) = 0 <0.000004>
[pid 32471] clock_gettime(CLOCK_MONOTONIC, {454148, 120296848}) = 0 <0.000014>
[pid 32471] clock_gettime(CLOCK_MONOTONIC, {454148, 120329244}) = 0 <0.000005>
[pid 32471] futex(0x7f03148dc7e4, FUTEX_WAIT_BITSET_PRIVATE, 25973, {454149, 120329244}, ffffffff <unfinished ...>
[pid 32470] <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) <1.000130>
[pid 32470] futex(0x7f0314dc94d8, FUTEX_WAKE_PRIVATE, 1) = 0 <0.000010>
[pid 32470] clock_gettime(CLOCK_MONOTONIC, {454148, 532433899}) = 0 <0.000005>
[pid 32470] clock_gettime(CLOCK_MONOTONIC, {454148, 532527808}) = 0 <0.000015>
[pid 32470] clock_gettime(CLOCK_MONOTONIC, {454148, 532562815}) = 0 <0.000006>
[pid 32470] futex(0x7f0314dc9464, FUTEX_WAIT_BITSET_PRIVATE, 25973, {454149, 532562815}, ffffffff <unfinished ...>
[pid 32471] <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) <1.000163>
[pid 32471] futex(0x7f03148dc858, FUTEX_WAKE_PRIVATE, 1) = 0 <0.000013>
[pid 32471] clock_gettime(CLOCK_MONOTONIC, {454149, 120641924}) = 0 <0.000006>
[pid 32471] clock_gettime(CLOCK_MONOTONIC, {454149, 120692457}) = 0 <0.000010>
[pid 32471] clock_gettime(CLOCK_MONOTONIC, {454149, 120715154}) = 0 <0.000005>
[pid 32471] futex(0x7f03148dc7e4, FUTEX_WAIT_BITSET_PRIVATE, 25975, {454150, 120715154}, ffffffff <unfinished ...>
[pid 32470] <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) <1.000141>
[pid 32470] futex(0x7f0314dc94d8, FUTEX_WAKE_PRIVATE, 1) = 0 <0.000009>
nginx.conf
user ubuntu;
worker_processes auto;
pid /run/nginx.pid;
env PATH;
events {
worker_connections 768;
}
http {
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 70;
types_hash_max_size 2048;
ssl_session_cache shared:SSL:10m;
ssl_session_timeout 10m;
include /etc/nginx/mime.types;
default_type application/octet-stream;
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
gzip on;
gzip_disable "msie6";
include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}
site.conf
upstream app {
server unix:/example_site/shared/tmp/sockets/puma.production.sock fail_timeout=0;
}
server {
listen 80;
listen 443 ssl;
sendfile off;
server_name example.com;
ssl_certificate /etc/nginx/ssl/example.com.crt;
ssl_certificate_key /etc/nginx/ssl/example.com.key;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # don’t use SSLv3 ref: POODLE
root /example_site/current/public;
try_files $uri/index.html $uri @app;
location @app {
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_read_timeout 30;
proxy_connect_timeout 60;
proxy_redirect off;
proxy_pass http://app;
}
error_page 500 502 503 504 /500.html;
client_max_body_size 4G;
keepalive_timeout 10;
}
Eu sou incrivelmente novo em usar strace e não tenho certeza do que estou vendo aqui e se isso é valioso para resolver o problema.
Alguém tem alguma idéia sobre o que está acontecendo e o que mais posso fazer para descobrir o que os tempos limite estão acontecendo?