我一直试图在RHEL 7.6上运行一个单节点docker群以进行测试。 firewalld已禁用且未运行。服务正在overlay网络上运行。我注意到我无法从主机或外部连接到已发布的端口。对于我尝试的一些RHEL实例，此行为是一致的。我确实在Ubuntu 16.04LTS和18.04LTS上使用了docker swarm，没有任何故障。
下面是我的docker info
Client:
Debug Mode: false
Server:
Containers: 14
Running: 3
Paused: 0
Stopped: 11
Images: 4
Server Version: 19.03.3
Storage Driver: overlay2
Backing Filesystem: xfs
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: fhewk7l15g42o36henpfigwjk
Is Manager: true
ClusterID: kegypzam66ehi6s50utrsff1l
Managers: 1
Nodes: 1
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: 10.0.1.125
Manager Addresses:
10.0.1.125:2377
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: bb71b10fd8f58240ca47fbb579b9d1028eea7c84
runc version: 2b18fe1d885ee5083ef9f0838fee39b62d653e30
init version: fec3683
Security Options:
seccomp
Profile: default
Kernel Version: 3.10.0-957.5.1.el7.x86_64
Operating System: Red Hat Enterprise Linux Server 7.6 (Maipo)
OSType: linux
Architecture: x86_64
CPUs: 4
Total Memory: 15.33GiB
Name: rhel-test.dev.koopid.io
ID: IM3X:THRY:FYUO:L7XI:VJW6:5B4Y:VZOX:YL43:E7WR:U5GM:3BQK:NLKP
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
还有我的overlaynet
[
{
"Name": "overlaynet",
"Id": "4g4dphekzyshqpcp0fjfmc877",
"Created": "2019-10-18T14:29:06.284905975Z",
"Scope": "swarm",
"Driver": "overlay",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": null,
"Config": [
{
"Subnet": "172.20.0.0/24",
"Gateway": "172.20.0.1"
}
]
},
"Internal": false,
"Attachable": true,
"Ingress": false,
"ConfigFrom": {
"Network": ""
},
"ConfigOnly": false,
"Containers": {
"142c22a7e517f463f37c89cfb58dcde37f9529c9b469357b37868057be044e48": {
"Name": "dbsvcs_redis.1.0lsxkr88eq89igid7w7ifk3wq",
"EndpointID": "167fbdfb2146f09bb20c258fea52d9f8ca886cf1d264b1d8cd9169532c26b9db",
"MacAddress": "02:42:ac:14:00:03",
"IPv4Address": "172.20.0.3/24",
"IPv6Address": ""
},
"2e70a7589f13c74be66149d5bbf9504b5b74aee1ad6711f82ec4b02011c00cc1": {
"Name": "dbpg_postgresql-rw.1.9keeuowk9zk5e6f8bq5a0itij",
"EndpointID": "44a2376b4d0d2bdb8787c9cc18726da140ca0f9a8e97e54a6a78b2206e10a13b",
"MacAddress": "02:42:ac:14:00:06",
"IPv4Address": "172.20.0.6/24",
"IPv6Address": ""
},
"d9119bb3d605aa9b2df23985cd884afa941499d888937e3c34f4ec08dac14c73": {
"Name": "dbsvcs_influxdb.1.ap5cg0se1rntdbsopxbm7whma",
"EndpointID": "d2a5c093a0721291a114309ef1fd690510b03007fdaf83c8d77e00870a1568cd",
"MacAddress": "02:42:ac:14:00:04",
"IPv4Address": "172.20.0.4/24",
"IPv6Address": ""
},
"lb-overlaynet": {
"Name": "overlaynet-endpoint",
"EndpointID": "2bdf0d2370856d9a4b2da1e86d65521585ffc89c778f5db1d3f4b2fd39da7c8b",
"MacAddress": "02:42:ac:14:00:08",
"IPv4Address": "172.20.0.8/24",
"IPv6Address": ""
}
},
"Options": {
"com.docker.network.driver.overlay.vxlanid_list": "4097"
},
"Labels": {},
"Peers": [
{
"Name": "80ab8f4e3bcd",
"IP": "10.0.1.125"
}
]
}
]
我有以下服务，并且您注意到，它们都发布一个或两个端口。
4j7p43udxkoc dbpg_postgresql-rw replicated 1/1 myregistry/postgres *:5432->5432/tcp
hu0wkspwc7j3 dbsvcs_influxdb replicated 1/1 myregistry/influxdb *:8086->8086/tcp
dlte2nzg226x dbsvcs_redis replicated 1/1 myregistry/redis *:6379->6379/tcp
您会看到主机上的INADDR_ANY端口5432已打开
tcp6 1 0 :::5432 :::* LISTEN
但是，我无法从外部主机连接到端口5432。 psql客户端超时，好像某个防火墙阻止了连接。
如果启用firewalld，我会看到以下错误
firewalld[2809]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w10 -t filter -X DOCKER-ISOLATION-STAGE-2' failed: iptables: No chain/target/match by that name.
firewalld[2809]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w10 -t filter -F DOCKER-ISOLATION' failed: iptables: No chain/target/match by that name.
firewalld[2809]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w10 -t filter -X DOCKER-ISOLATION' failed: iptables: No chain/target/match by that name.
firewalld[2809]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w10 -D FORWARD -i docker0 -o docker0 -j DROP' failed: iptables: Bad rule (does a matching rule exist in that chain?).
firewalld[2809]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w10 -D FORWARD -i docker_gwbridge -o docker_gwbridge -j ACCEPT' failed: iptables: Bad rule (does a matching rule exist in that chain?).
firewalld[2809]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w10 -D FORWARD -i docker0 -o docker0 -j DROP' failed: iptables: Bad rule (does a matching rule exist in that chain?).
firewalld[2809]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w10 -t filter -nL DOCKER-INGRESS' failed: iptables: No chain/target/match by that name.
firewalld[2809]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w10 -t filter -nL DOCKER-INGRESS' failed: iptables: No chain/target/match by that name.
firewalld[2809]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w10 -t filter -nL DOCKER-INGRESS' failed: iptables: No chain/target/match by that name.
firewalld[2809]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w10 -t filter -nL DOCKER-INGRESS' failed: iptables: No chain/target/match by that name.
我应该担心吗？我是否需要在RHEL上摆弄iptables才能使docker swarm正常工作。有一些报告将Docker控制端口添加到iptables以进行多节点集群配置。我的iptable配置是这样的...
$ iptables -L -v -n --line-numbers
Chain INPUT (policy ACCEPT 82507 packets, 8110K bytes)
num pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
num pkts bytes target prot opt in out source destination
1 30 5664 DOCKER-USER all -- * * 0.0.0.0/0 0.0.0.0/0
2 30 5664 DOCKER-INGRESS all -- * * 0.0.0.0/0 0.0.0.0/0
3 30 5664 DOCKER-ISOLATION-STAGE-1 all -- * * 0.0.0.0/0 0.0.0.0/0
4 0 0 ACCEPT all -- * docker0 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED
5 0 0 DOCKER all -- * docker0 0.0.0.0/0 0.0.0.0/0
6 0 0 ACCEPT all -- docker0 !docker0 0.0.0.0/0 0.0.0.0/0
7 0 0 ACCEPT all -- docker0 docker0 0.0.0.0/0 0.0.0.0/0
8 14 4064 ACCEPT all -- * docker_gwbridge 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED
9 0 0 DOCKER all -- * docker_gwbridge 0.0.0.0/0 0.0.0.0/0
10 16 1600 ACCEPT all -- docker_gwbridge !docker_gwbridge 0.0.0.0/0 0.0.0.0/0
11 0 0 DROP all -- docker_gwbridge docker_gwbridge 0.0.0.0/0 0.0.0.0/0
Chain OUTPUT (policy ACCEPT 82105 packets, 8106K bytes)
num pkts bytes target prot opt in out source destination
Chain DOCKER (2 references)
num pkts bytes target prot opt in out source destination
Chain DOCKER-INGRESS (1 references)
num pkts bytes target prot opt in out source destination
1 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:5432
2 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED tcp spt:5432
3 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:6379
4 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED tcp spt:6379
5 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:8086
6 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED tcp spt:8086
7 30 5664 RETURN all -- * * 0.0.0.0/0 0.0.0.0/0
Chain DOCKER-ISOLATION-STAGE-1 (1 references)
num pkts bytes target prot opt in out source destination
1 0 0 DOCKER-ISOLATION-STAGE-2 all -- docker0 !docker0 0.0.0.0/0 0.0.0.0/0
2 16 1600 DOCKER-ISOLATION-STAGE-2 all -- docker_gwbridge !docker_gwbridge 0.0.0.0/0 0.0.0.0/0
3 30 5664 RETURN all -- * * 0.0.0.0/0 0.0.0.0/0
Chain DOCKER-ISOLATION-STAGE-2 (2 references)
num pkts bytes target prot opt in out source destination
1 0 0 DROP all -- * docker0 0.0.0.0/0 0.0.0.0/0
2 0 0 DROP all -- * docker_gwbridge 0.0.0.0/0 0.0.0.0/0
3 16 1600 RETURN all -- * * 0.0.0.0/0 0.0.0.0/0
Chain DOCKER-USER (1 references)
num pkts bytes target prot opt in out source destination
1 30 5664 RETURN all -- * * 0.0.0.0/0 0.0.0.0/0
感谢一些帮助/指导，以便在RHEL上正常工作，因为最近两周我一直在坚持。在Ubuntu上配置和运行docker swarm轻而易举！！
这是我终于开始工作的方式。我没有所有步骤的理由。我还注意到，我无法连接到localhost中的服务发布的端口，并且firewalld规则在需要重新启动的时间混乱了。我仍在调查这些问题。我按照answer by Bertrand_Szoghy首先安装docker-ce和相关软件包。
firewalld或ipchain需要安装在服务器上。建议在RHEL 7或更高版本上使用firewalld。 docker swarm端口。遵循tutorial here。另外，请确保打开服务所需的端口。重新加载防火墙规则（firewall-cmd --reload）docker swarm init）docker network create --subnet 172.20.1.0/24 --driver overlay --attachable overlaynet）我注意到在初始化docker swarm之前，防火墙配置很重要。初始化docker swarm后更新防火墙配置时，无法从本地主机连接到已发布的端口，也无法使用主机IP。我不确定为什么这个命令很重要。
目前，我可以通过swarm manager IP地址从群集管理器本身或从主机外部连接到已发布的服务端口。我仍在研究要为通过localhost连接而添加的防火墙规则。