【Openstack】nova-docker現狀
作者：追尋神跡
nova-docker插件h版出現，但是在i版本從nova中移出，作為孵化項目培養。
nova-docker現狀
nova-docker插件h版出現，但是在i版本從nova中移出，作為孵化項目培養。
當時給出的解釋是，希望能更快的進行迭代開發，支持cinder和neutron。并計劃在K版本release時重新進入。
nova-docker的架構
目前的架構如下（其中docker registry已經不需要了）。
從圖中可以看出，這種使用方法，docker相當于一種新的hypervisor。
把容器當做虛擬機來使用。
其中容器鏡像通過docker save保存成tar包，放置在glance上管理。
創建容器時，從glance上下載容器鏡像，利用（docker load）加載并啟動容器鏡像。
支持功能
- 支持容器創建/刪除/軟刪除/重啟/暫停/解除暫定/停止/開始。
- 支持對容器創建快照，支持基于快照恢復容器。
- 支持對容器設置插拔網卡。
- 查詢docker節點上CPU/內存使用情況/查詢可用節點。
- 查詢docker容器。
- 查詢容器console輸出。
- 支持neutron網絡/nova-network網絡。
- 支持綁定浮動IP。
- 不支持共享存儲。
- 不支持掛卷/卸卷操作。
- 不支持遷移，rescue等操作。
- 不支持設置安全組規則。（從代碼上看，留的有框架，但是目前并不支持。使用的NoopFirewallDriver。)
- 容器使用的是本地存儲，不能使用cinder共享存儲。
#p#
網絡實現
查看容器的namespace:
- [root@localhost ~]# docker ps --no-trunc
- CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
- 54ba6c67de05b8c5ddb824497eae0071f902dcdea05ce93109d9791453dfeb17 tutum/wordpress:latest "/run.sh" 15 hours ago Up 15 hours nova-ee2edd99-a64c-4701-84ad-faccd3b1a246
- [root@localhost ~]# ip netns list
- 54ba6c67de05b8c5ddb824497eae0071f902dcdea05ce93109d9791453dfeb17
- qdhcp-78277811-dc20-47c0-8319-58894843e3d4
- 3ce4e73bcfeb64b994a5bf87c7f49553ca3583308b93878a07679a742661b0a4
- qdhcp-bc557a68-425e-4f24-bb6c-627500647856
- ee3b2cc56a0ccae387371cf8eb6ad7f43712cf1cbdc66bf46af77f3c929be34a
- qrouter-818c4149-355d-4409-8dda-f412da898ff0
查看namespace中網絡：
- [root@localhost ~]# ip netns exec 54ba6c67de05b8c5ddb824497eae0071f902dcdea05ce93109d9791453dfeb17 ip addr
- 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
- link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
- inet 127.0.0.1/8 scope host lo
- valid_lft forever preferred_lft forever
- inet6 ::1/128 scope host
- valid_lft forever preferred_lft forever
- 28: nse54c9783-26: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
- link/ether fa:16:3e:d8:9b:e8 brd ff:ff:ff:ff:ff:ff
- inet 10.0.0.2/24 brd 10.0.0.255 scope global nse54c9783-26
- valid_lft forever preferred_lft forever
- inet6 fe80::f816:3eff:fed8:9be8/64 scope link
- valid_lft forever preferred_lft forever
查看設備28的關聯veth pair：
- [root@localhost ~]# ip netns exec 54ba6c67de05b8c5ddb824497eae0071f902dcdea05ce93109d9791453dfeb17 ethtool -S nse54c9783-26
- NIC statistics:
- peer_ifindex: 29
- [root@localhost ~]# ip addr
- ...
- 29: tape54c9783-26: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master ovs-system state UP qlen 1000
- link/ether 82:31:7f:dc:e3:8f brd ff:ff:ff:ff:ff:ff
- inet6 fe80::8031:7fff:fedc:e38f/64 scope link
- valid_lft forever preferred_lft forever
- ...
查看設備29關聯設備：(設備掛在OVS網橋的br-int上）
- [root@localhost ~]# ovs-vsctl show
- 2368aead-599b-4cd8-b2a1-dd01041e5635
- Bridge br-ex
- Port br-ex
- Interface br-ex
- type: internal
- Port "qg-83cd012e-53"
- Interface "qg-83cd012e-53"
- type: internal
- Bridge br-int
- fail_mode: secure
- Port "tapbf138559-94"
- tag: 3
- Interface "tapbf138559-94"
- Port "tape54c9783-26"
- tag: 1
- Interface "tape54c9783-26"
- Port "tap7687fcec-f0"
- tag: 2
- Interface "tap7687fcec-f0"
- Port br-int
- Interface br-int
- type: internal
- Port "qr-9712c2ca-1f"
- tag: 1
- Interface "qr-9712c2ca-1f"
- type: internal
- Port patch-tun
- Interface patch-tun
- type: patch
- options: {peer=patch-int}
- Port "tap5f8409aa-f9"
- tag: 3
- Interface "tap5f8409aa-f9"
- type: internal
- Port "tapeb9206a8-85"
- tag: 1
- Interface "tapeb9206a8-85"
- type: internal
- Bridge br-tun
- Port patch-int
- Interface patch-int
- type: patch
- options: {peer=patch-tun}
- Port br-tun
- Interface br-tun
- type: internal
- ovs_version: "2.0.0"
備注：因為是個單機環境，沒有給br-int配置具體的物理網卡。
容器DHCP服務與綁定Floating IP:
- //10.0.0.0/24網段的DHCP服務
- [root@localhost ~]# ip netns exec qdhcp-78277811-dc20-47c0-8319-58894843e3d4 ip addr
- 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
- link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
- inet 127.0.0.1/8 scope host lo
- valid_lft forever preferred_lft forever
- inet6 ::1/128 scope host
- valid_lft forever preferred_lft forever
- 27: tapeb9206a8-85: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
- link/ether fa:16:3e:6e:1b:13 brd ff:ff:ff:ff:ff:ff
- inet 10.0.0.3/24 brd 10.0.0.255 scope global tapeb9206a8-85
- valid_lft forever preferred_lft forever
- inet6 fe80::f816:3eff:fe6e:1b13/64 scope link
- valid_lft forever preferred_lft forever
- //可以看出通過router將內部10.0.0.0/24的網絡與外部172.24.4.0/24的兩個IP打通
- [root@localhost ~]# ip netns exec qrouter-818c4149-355d-4409-8dda-f412da898ff0 ip addr
- 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
- link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
- inet 127.0.0.1/8 scope host lo
- valid_lft forever preferred_lft forever
- inet6 ::1/128 scope host
- valid_lft forever preferred_lft forever
- 19: qr-9712c2ca-1f: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
- link/ether fa:16:3e:50:18:19 brd ff:ff:ff:ff:ff:ff
- inet 10.0.0.1/24 brd 10.0.0.255 scope global qr-9712c2ca-1f
- valid_lft forever preferred_lft forever
- inet6 fe80::f816:3eff:fe50:1819/64 scope link
- valid_lft forever preferred_lft forever
- 20: qg-83cd012e-53: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
- link/ether fa:16:3e:0d:4e:c2 brd ff:ff:ff:ff:ff:ff
- inet 172.24.4.2/24 brd 172.24.4.255 scope global qg-83cd012e-53
- valid_lft forever preferred_lft forever
- inet 172.24.4.6/32 brd 172.24.4.6 scope global qg-83cd012e-53
- valid_lft forever preferred_lft forever
- inet6 fe80::f816:3eff:fe0d:4ec2/64 scope link
- valid_lft forever preferred_lft forever
- //IP綁定的NAT規則
- [root@localhost ~]# ip netns exec qrouter-818c4149-355d-4409-8dda-f412da898ff0 iptables-save
- -A neutron-l3-agent-PREROUTING -d 172.24.4.6/32 -j DNAT --to-destination 10.0.0.2
- -A neutron-l3-agent-float-snat -s 10.0.0.2/32 -j SNAT --to-source 172.24.4.6
參考：
1. http://www.opencontrail.org/openstack-docker-opencontrail/
2. http://technodrone.blogspot.com/2014/10/nova-docker-on-juno.html
本文出自：http://blog.csdn.net/halcyonbaby/article/details/41855917
責任編輯：Ophira
來源：
追尋神跡的博客
