我有一个docker swarm模式,有一个HAProxy容器和3个python web应用程序。带有HAProxy的容器是暴露端口80,应该对我的应用程序的3个容器进行负载平衡(通过leastconn
)。在
这是我的docker-compose.yml
文件:
version: '3'
services:
scraper-node:
image: scraper
ports:
- 5000
volumes:
- /profiles:/profiles
command: >
bash -c "
cd src;
gunicorn src.interface:app \
--bind=0.0.0.0:5000 \
--workers=1 \
--threads=1 \
--timeout 500 \
--log-level=debug \
"
environment:
- SERVICE_PORTS=5000
deploy:
replicas: 3
update_config:
parallelism: 5
delay: 10s
restart_policy:
condition: on-failure
max_attempts: 3
window: 120s
networks:
- web
proxy:
image: dockercloud/haproxy
depends_on:
- scraper-node
environment:
- BALANCE=leastconn
volumes:
- /var/run/docker.sock:/var/run/docker.sock
ports:
- 80:80
networks:
- web
networks:
web:
driver: overlay
当我部署这个群(docker stack deploy --compose-file=docker-compose.yml scraper
)时,我得到了我所有的容器:
当我显示haproxy
容器日志时,他似乎识别出了3个python容器:
INFO:haproxy:dockercloud/haproxy 1.6.6 is running outside Docker Cloud
INFO:haproxy:Haproxy is running in SwarmMode, loading HAProxy definition through docker api
INFO:haproxy:dockercloud/haproxy PID: 6
INFO:haproxy:=> Add task: Initial start - Swarm Mode
INFO:haproxy:=> Executing task: Initial start - Swarm Mode
INFO:haproxy:==========BEGIN==========
INFO:haproxy:Linked service: scraper_scraper-node
INFO:haproxy:Linked container: scraper_scraper-node.1.0u8q4zn432n7p5gl93ohqio8e, scraper_scraper-node.2.wem9v2nug8wqos7d97zknuvqb, scraper_scraper-node.3.iyi33hv9tikmf6m2wna0cypgp
INFO:haproxy:HAProxy configuration:
global
log 127.0.0.1 local0
log 127.0.0.1 local1 notice
log-send-hostname
maxconn 4096
pidfile /var/run/haproxy.pid
user haproxy
group haproxy
daemon
stats socket /var/run/haproxy.stats level admin
ssl-default-bind-options no-sslv3
ssl-default-bind-ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA:DHE-DSS-AES128-SHA:DES-CBC3-SHA
defaults
balance leastconn
log global
mode http
option redispatch
option httplog
option dontlognull
option forwardfor
timeout connect 5000
timeout client 50000
timeout server 50000
listen stats
bind :1936
mode http
stats enable
timeout connect 10s
timeout client 1m
timeout server 1m
stats hide-version
stats realm Haproxy\ Statistics
stats uri /
stats auth stats:stats
frontend default_port_80
bind :80
reqadd X-Forwarded-Proto:\ http
maxconn 4096
default_backend default_service
backend default_service
server scraper_scraper-node.1.0u8q4zn432n7p5gl93ohqio8e 10.0.0.5:5000 check inter 2000 rise 2 fall 3
server scraper_scraper-node.2.wem9v2nug8wqos7d97zknuvqb 10.0.0.6:5000 check inter 2000 rise 2 fall 3
server scraper_scraper-node.3.iyi33hv9tikmf6m2wna0cypgp 10.0.0.7:5000 check inter 2000 rise 2 fall 3
INFO:haproxy:Launching HAProxy
INFO:haproxy:HAProxy has been launched(PID: 12)
INFO:haproxy:===========END===========
但是当我试图GET
到http://localhost
时,我得到一条错误消息:
<html>
<body>
<h1>503 Service Unavailable</h1>
No server is available to handle this request.
</body>
</html>
有两个问题:
docker-compose.yml
文件中的command
应该是一行。在scraper
映像应该暴露端口5000(在他的Dockerfile
中)。在一旦我修复了这些问题,我就以同样的方式部署这个群(使用
stack
),并且proxy
容器识别python容器,并能够在它们之间实现负载平衡。在503错误通常意味着后端服务器的健康检查失败。在
您的stats页面在这里可能会有所帮助:如果您将鼠标移到某个宕机的后端服务器的
LastChk
列上,HAProxy会给您一个模糊的摘要,说明该服务器为什么会关闭:看起来您没有为您的
default_service
后端配置健康检查(option httpchk
):您能直接访问任何后端服务器吗(例如curl head 10.0.0.5:5000
)?从the HAProxy documentation:相关问题 更多 >
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