Estoy intentando llegar a 2000 usuarios simultáneos con mi herramienta de evaluación comparativa. Estoy usando langosta para simularlos.
Mi servidor tiene 24vCPU, 128 GB de RAM, 25 SSD.
Quiero poder atender a 2000 usuarios simultáneos sin errores, pero después de solo 700 usuarios tengo problemas.
gunicornio
Instalé gevent para poder servir asíncrono, pero esto no cambió nada en mi prueba de carga (¿es posible que gevent no esté funcionando?). Mi archivo systemd es el siguiente:
mysite-production.conf
[Unit]
Description=mysite production daemon
After=network.target
[Service]
User=www-data
Group=www-data
WorkingDirectory=/var/www/mysite/production/src
ExecStart=/var/www/mysite/production/venv/bin/gunicorn --worker-class=gevent --worker-connections=1000 --workers=49 --bind unix:/var/www/mysite/production/sock/gunicorn --log-level DEBUG --log-file '/var/www/mysite/production/log/gunicorn.log' mysite.wsgi:application
ExecReload=/bin/kill -s HUP $MAINPID
ExecStop=/bin/kill -s TERM $MAINPID
[Install]
WantedBy=multi-user.target
Según mis cálculos: 49 x 1000 = 49000 solicitudes por segundo que podría estar atendiendo.
En cambio, con aproximadamente 700 usuarios, aparece el siguiente error en la pestaña de fallas de langosta:
# fails Method Name Type
1227 GET // HTTPError('500 Server Error: Internal Server Error for url: http://my.site.com//')
Básicamente dice que tengo un error interno del servidor.
cuando abro mi gunicorn.log veoIgnorando EPIPE:
gunicorn.log
[2020-01-27 20:22:30 +0000] [13121] [DEBUG] Ignoring EPIPE
[2020-01-27 20:22:31 +0000] [13121] [DEBUG] Ignoring EPIPE
[2020-01-27 20:22:31 +0000] [13121] [DEBUG] Ignoring EPIPE
[2020-01-27 20:22:31 +0000] [13121] [DEBUG] Ignoring EPIPE
[2020-01-27 20:22:31 +0000] [13121] [DEBUG] Ignoring EPIPE
nginx
Mi nginx access.log muestra algunos errores 499 y 500:
acceso.log
185.159.126.246 - - [27/Jan/2020:19:22:25 +0000] "GET // HTTP/1.1" 200 30727 "-" "python-requests/2.22.0"
185.159.126.246 - - [27/Jan/2020:19:22:25 +0000] "GET // HTTP/1.1" 499 0 "-" "python-requests/2.22.0"
185.159.126.246 - - [27/Jan/2020:19:22:25 +0000] "GET // HTTP/1.1" 499 0 "-" "python-requests/2.22.0"
185.159.126.246 - - [27/Jan/2020:19:22:25 +0000] "GET // HTTP/1.1" 200 30727 "-" "python-requests/2.22.0"
185.159.126.246 - - [27/Jan/2020:19:22:25 +0000] "GET // HTTP/1.1" 500 2453 "-" "python-requests/2.22.0"
185.159.126.246 - - [27/Jan/2020:19:22:25 +0000] "GET // HTTP/1.1" 500 2453 "-" "python-requests/2.22.0"
185.159.126.246 - - [27/Jan/2020:19:22:25 +0000] "GET // HTTP/1.1" 499 0 "-" "python-requests/2.22.0"
185.159.126.246 - - [27/Jan/2020:19:22:25 +0000] "GET // HTTP/1.1" 499 0 "-" "python-requests/2.22.0"
el nginx error.log no muestra nada, pero en la prueba anterior sí mostróRecurso temporal no disponible:
registro de errores
2020/01/27 19:15:32 [error] 1514#1514: *57151 connect() to unix:/var/www/mysite/production/sock/gunicorn failed (11: Resource temporarily unavailable) while connecting to upstream, client: 185.159.126.246, server: my.site.com, request: "GET // HTTP/1.1", upstream: "http://unix:/var/www/mysite/production/sock/gunicorn://", host: "my.site.com"
2020/01/27 19:15:32 [error] 1514#1514: *56133 connect() to unix:/var/www/mysite/production/sock/gunicorn failed (11: Resource temporarily unavailable) while connecting to upstream, client: 185.159.126.246, server: my.site.com, request: "GET // HTTP/1.1", upstream: "http://unix:/var/www/mysite/production/sock/gunicorn://", host: "my.site.com"
Aquí está mi nginx.conf:
nginx.conf
user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;
worker_rlimit_nofile 40000;
events {
worker_connections 4096;
# multi_accept on;
}
http {
##
# Basic Settings
##
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
# server_tokens off;
# server_names_hash_bucket_size 64;
# server_name_in_redirect off;
include /etc/nginx/mime.types;
default_type application/octet-stream;
##
# SSL Settings
##
ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;
##
# Logging Settings
##
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
##
# Gzip Settings
##
gzip on;
# gzip_vary on;
# gzip_proxied any;
# gzip_comp_level 6;
# gzip_buffers 16 8k;
# gzip_http_version 1.1;
# gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
##
# Virtual Host Configs
##
include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}
y aquí está mi bloque de servidor:
my.site.com (bloque de servidor)
upstream mysite-production {
server unix:/var/www/mysite/production/sock/gunicorn;
}
server {
listen [::]:80;
listen 80;
server_name my.site.com;
# set client body size to 100M #
client_max_body_size 100M;
location / {
include proxy_params;
proxy_pass http://unix:/var/www/mysite/production/sock/gunicorn;
}
location /static/ {
root /var/www/mysite/production/;
expires 30d;
add_header Vary Accept-Encoding;
access_log off;
gzip on;
gzip_comp_level 6;
gzip_vary on;
gzip_types text/plain text/css application/json application/x-javascript application/javascript text/xml application/xml application/rss+xml text/javascript image/svg+xml application/vnd.ms-fontobject application/x-font-ttf font/opentype;
}
location /media/ {
root /var/www/mysite/production/;
expires 30d;
add_header Vary Accept-Encoding;
access_log off;
}
}
Preguntas
Preguntas que surgen cuando miro todo esto:
¿De dónde viene el error 502? No me muestra suficiente información para entender lo que está pasando... ¿Están todos mis trabajadores ocupados después de 700 usuarios causando los errores?
¿De dónde viene el error 499?
¿Tiene algo que ver con mi base de datos postgresql? si es así ¿cómo me entero?
¿Cómo puedo saber si gevent ha funcionado o no? Los resultados de las pruebas de carga con ab y locust no han cambiado realmente.
Que haceIgnorando EPIPE¿Qué significa y por qué sucede?
Le agradezco que se haya tomado el tiempo de mirar esto. ¡Gracias de antemano por todos sus comentarios y respuestas!
Si necesita más información, hágamelo saber y la agregaré a mi pregunta.
EDITAR:
Según el comentario de @ServerFaults, verifiqué cuánta memoria se agota cuando se realiza la prueba de carga. aparentemente nada realmente significativo:
MemTotal: 132027088 kB
MemFree: 127013484 kB
MemAvailable: 126458072 kB
Buffers: 57788 kB
Cached: 401088 kB
Después de ejecutar netstat -s(no tengo el conocimiento para entender lo que significa todo):
Ip:
Forwarding: 2
6956023 total packets received
8 with invalid addresses
0 forwarded
0 incoming packets discarded
6953503 incoming packets delivered
6722961 requests sent out
20 outgoing packets dropped
Icmp:
107 ICMP messages received
0 input ICMP message failed
ICMP input histogram:
destination unreachable: 45
echo requests: 62
968 ICMP messages sent
0 ICMP messages failed
ICMP output histogram:
destination unreachable: 906
echo replies: 62
IcmpMsg:
InType3: 45
InType8: 62
OutType0: 62
OutType3: 906
Tcp:
222160 active connection openings
136492 passive connection openings
78293 failed connection attempts
161239 connection resets received
2 connections established
6245053 segments received
6487229 segments sent out
11978 segments retransmitted
0 bad segments received
185530 resets sent
Udp:
667101 packets received
41158 packets to unknown port received
0 packet receive errors
727164 packets sent
0 receive buffer errors
0 send buffer errors
UdpLite:
TcpExt:
2939 SYN cookies sent
28 SYN cookies received
215 invalid SYN cookies received
113 resets received for embryonic SYN_RECV sockets
18751 TCP sockets finished time wait in fast timer
175 packetes rejected in established connections because of timestamp
61997 delayed acks sent
54 delayed acks further delayed because of locked socket
Quick ack mode was activated 3475 times
2687504 packet headers predicted
1171485 acknowledgments not containing data payload received
2270054 predicted acknowledgments
TCPSackRecovery: 921
Detected reordering 22500 times using SACK
Detected reordering 596 times using time stamp
139 congestion windows fully recovered without slow start
490 congestion windows partially recovered using Hoe heuristic
TCPDSACKUndo: 14
413 congestion windows recovered without slow start after partial ack
TCPLostRetransmit: 47
TCPSackFailures: 5
7 timeouts in loss state
2416 fast retransmits
123 retransmits in slow start
TCPTimeouts: 5279
TCPLossProbes: 4284
TCPLossProbeRecovery: 22
TCPSackRecoveryFail: 1
TCPDSACKOldSent: 3482
TCPDSACKRecv: 1996
TCPDSACKOfoRecv: 4
52968 connections reset due to unexpected data
54079 connections reset due to early user close
51 connections aborted due to timeout
TCPDSACKIgnoredOld: 25
TCPDSACKIgnoredNoUndo: 822
TCPSpuriousRTOs: 81
TCPSackShifted: 4787
TCPSackMerged: 5128
TCPSackShiftFallback: 33199
TCPReqQFullDoCookies: 2939
TCPRcvCoalesce: 84434
TCPOFOQueue: 26
TCPChallengeACK: 3
TCPAutoCorking: 7
TCPFromZeroWindowAdv: 125
TCPToZeroWindowAdv: 125
TCPWantZeroWindowAdv: 1376
TCPSynRetrans: 4695
TCPOrigDataSent: 5023492
TCPHystartTrainDetect: 2403
TCPHystartTrainCwnd: 53596
TCPHystartDelayDetect: 346
TCPHystartDelayCwnd: 9883
TCPACKSkippedSynRecv: 6
TCPACKSkippedPAWS: 10
TCPACKSkippedSeq: 15
TCPWinProbe: 15
IpExt:
InOctets: 6090026491
OutOctets: 7098177391
InNoECTPkts: 6966279
InECT0Pkts: 11
InCEPkts: 1
Edición 2:
Después de crear una página HTML estática sin generar Gunicorn, pudo atender fácilmente a 4000 usuarios sin demoras. Después de pasar las conexiones_trabajadores recibí:
/loadtest/ ConnectionError(MaxRetryError("HTTPConnectionPool(host='ll-my.site.com', port=80): Max retries exceeded with url: /loadtest/ (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x....>: Failed to establish a new connection: [Errno 8] nodename nor servname provided, or not known'))"))
Por lo que entiendo de esto, NGINX no es un problema aquí.
Edición 3:
Revisé mis registros de PostgreSQL y descubrí que están llenos de este error:
FATAL: remaining connection slots are reserved for non-replication superuser connections