twtrubiks / docker-swarm-tutorial Goto Github PK

docker info :
Server:
Containers: 11
Running: 0
Paused: 0
Stopped: 11
Images: 177
Server Version: v19.03.13-ce
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: active
NodeID: n4u95097aotp2sqs3svzbkilz
Is Manager: true
ClusterID: unv3pcfn08urwffa1r4efh8v2
Managers: 1
Nodes: 2
Default Address Pool: 10.0.0.0/8
SubnetSize: 24
Data Path Port: 4789
Orchestration:
Task History Retention Limit: 5
Raft:
Snapshot Interval: 10000
Number of Old Snapshots to Retain: 0
Heartbeat Tick: 1
Election Tick: 10
Dispatcher:
Heartbeat Period: 5 seconds
CA Configuration:
Expiry Duration: 3 months
Force Rotate: 0
Autolock Managers: false
Root Rotation In Progress: false
Node Address: 192.168.1.163
Manager Addresses:
192.168.1.163:2377
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 409c87ba59dd96965239573aa9458a3585c05468.m
runc version: 49a73463331bd8ff44bb8349e33f4b2e1ae34b4f-dirty
init version: fec3683-dirty (expected: fec3683b971d9)
Kernel Version: 5.10.9-1.0.0+g3b269ae1f823
Operating System: NXP i.MX Release Distro 5.10-gatesgarth (gatesgarth)
OSType: linux
Architecture: aarch64
Docker Root Dir: /var/lib/docker
Debug Mode: false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false

WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled

當我進行到 'docker service update --publish-add 80 my_nginx'
會有以下錯誤
"error creating external connectivity network: cannot restrict inter-container communication: please ensure that br_netfilter kernel module is loaded"
可否請教您，是否有遇過該狀況？

這邊有可能有時候會遇到，你打開網頁，發現顯示找不到網頁的狀況，會發生這個原因是因為啟動順序
的問題，因為有可能 web service 比 db service 早啟動完成，所以導致 web 無法連上 db 😭
這時候該怎麼解決呢❓
這裡先提供一個方法，想法很簡單，就是將 web service 重新啟動，這樣就可以連到 db 了 ☺️
如果有更好的方法歡迎提供，謝謝。

U can use the "wait-for-it" script to control these.

swarm 時 為什麼web這樣的config 能知道要連到哪一個db (ip:port) ,
web 連線db 的設定值並沒有看見?

web:
image: twtrubiks/my_swarm_secrets_demo
ports:
- "8000:8000"
networks:
- backend
deploy:
replicas: 4
update_config:
parallelism: 2
restart_policy:
condition: on-failure
secrets:
- my_password
depends_on:
- db

# Configure HAProxy to route requests to swarm nodes on port 8000
backend http_back
    log global
    balance roundrobin
    http-request replace-value Host .* info.cern.ch
    server node4 192.168.99.105:8080 check
    server node1 192.168.99.105:8000 check
    server node2 192.168.99.106:8000 check
    server node3 192.168.99.107:8000 check

我在haproxy的路由规则中加入了node4的路由规则，visualizer的url是http://ip:port这样的形式, 这样和django的url可能存在矛盾，这样，路由的时候，加载的页面将按照路由的顺序交替变化，有啥方法可以解决这样的问题？