问题说明
在部署open stack的NOVA组件时，注册API端口到placement的service中，出现如下错误
1 [root@ct ~]# openstack endpoint create --region RegionOne placement public http://ct:8778
2 Failed to discover available identity versions when contacting http://ct:5000/v3. Attempti ng to parse version from URL.
3 Unable to establish connection to http://ct:5000/v3/auth/tokens: HTTPConnectionPool(host=' ct', port=5000): Max retries exceeded with url: /v3/auth/tokens (Caused by NewConnectionEr ror('<urllib3.connection.HTTPConnection object at 0x7fa784987c10>: Failed to establish a n ew connection: [Errno 111] xe6x8bx92xe7xbbx9dxe8xbfx9exe6x8exa5',))
解决方案
使用curl，查看报错返回的地址
1 [root@ct ~]# curl http://ct:5000/v3
2 curl: (7) Failed connect to ct:5000; 拒绝连接
监听5000端口，发现并没有返回信息，原来是之前重启ct导致apache没有开启（但我记得之前设置了开机自启的）
1 [root@ct ~]# netstat -anpt | grep 5000
重启apache服务即可解决
1 [root@ct ~]# systemctl start httpd
2 [root@ct ~]# systemctl status httpd
3 ● httpd.service - The Apache HTTP Server
4 Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
5 Active: active (running) since 一 2020-12-28 14:55:25 CST; 2s ago
6 Docs: man:httpd(8)
7 man:apachectl(8)
8 Main PID: 5797 (httpd)
9 Status: "Processing requests..."
10 CGroup: /system.slice/httpd.service
11 ├─5797 /usr/sbin/httpd -DFOREGROUND
12 ├─5804 /usr/sbin/httpd -DFOREGROUND
13 ├─5805 /usr/sbin/httpd -DFOREGROUND
14 ├─5806 /usr/sbin/httpd -DFOREGROUND
15 ├─5807 (wsgi:keystone- -DFOREGROUND
16 ├─5808 (wsgi:keystone- -DFOREGROUND
17 ├─5809 (wsgi:keystone- -DFOREGROUND
18 ├─5810 (wsgi:keystone- -DFOREGROUND
19 ├─5811 (wsgi:keystone- -DFOREGROUND
20 ├─5812 /usr/sbin/httpd -DFOREGROUND
21 ├─5813 /usr/sbin/httpd -DFOREGROUND
22 ├─5814 /usr/sbin/httpd -DFOREGROUND
23 ├─5815 /usr/sbin/httpd -DFOREGROUND
24 └─5816 /usr/sbin/httpd -DFOREGROUND
25
26 12月 28 14:55:25 ct systemd[1]: Starting The Apache HTTP Server...
27 12月 28 14:55:25 ct systemd[1]: Started The Apache HTTP Server.
28 [root@ct ~]# curl http://ct:5000/v3
29 {"version": {"status": "stable", "updated": "2019-07-19T00:00:00Z", "media-types": [{"base": "application/json", "type": "application/vnd.openstack.identity-v3+json"}], "id": "v3.13", "links": [{"href": "http://ct:5000/v3/", "rel": "self"}]}}