使用docker在搭建lvs環境

介紹

lvs是一款出色的負載平衡軟體，被廣泛的用於各大知名網站，其支援多種負載平衡方式，如：[VS/NAT，VS/TUN，VS/DR和full NAT，原來在搭建一個lvs的測試環境時，往往需要多台物理主機或者是虛擬機器，在本文中將介紹一種使用docker在一個虛擬機器上搭建LVS叢集的方式，方便開發人員在開發與測試階段使用 環境搭建 安裝虛擬機器環境，這裡在window7上，使用virtualbox，安裝64位的centos7，在安裝過程選擇 minimal 就可以了 由於在這個環境的搭建中使用到了docker和 docker-compose，所以首先設定國內比較快的yum源，推薦使用阿里雲的yum源

由於使用到了docker-compose，並且通過pip來安裝docker-compose，因此先通過yum來安裝 pip,步驟如下：

          | yum -y install epel-release |          | yum -y install python-pip   |          | yum clean all               |

通過pip安裝docker-compose

       |   pip install -U docker-compose  |

從github上將附件下載下來，放置到linux作業系統的某個目錄下

解壓後，在解壓的目錄下，運行 docker-compose up

這樣就通過docker-compose將這個lvs的運行環境搭建成功了 相關配置的分析

在這個環境中，lvs的兩個docker容器的ip，如下表所示，在dockermaster_lvs1 上有分配的lvs分配的vip：172.17.0.8

[root@localhost ~]# docker psCONTAINER ID        IMAGE                  COMMAND             CREATED            STATUS              PORTS               NAMES9e52f1b85d79        dockermaster_client1   "sleep 2h"          2 days ago         Up 2 minutes        22/tcp              dockermaster_client1_1ca7970401fa0        dockermaster_web2      "sh local.rc"       2 days ago         Up 2 minutes        22/tcp, 80/tcp      dockermaster_web2_10018316201a0        dockermaster_web1      "sh local.rc"       2 days ago         Up 2 minutes        22/tcp, 80/tcp      dockermaster_web1_1ed93d015bc56        dockermaster_lvs1      "/app/run.sh"       2 days ago         Up 3 minutes        22/tcp, 80/tcp      dockermaster_lvs1_1eac75212a3b7        dockermaster_lvs2      "/app/run.sh"       2 days ago         Up 3 minutes        22/tcp, 80/tcp      dockermaster_lvs2_1[root@localhost ~]# docker exec -ti ed93d015bc56 /bin/shsh-4.1# ip addr1: 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 forever6: eth0@if7: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue state UP    link/ether 02:42:ac:11:00:03 brd ff:ff:ff:ff:ff:ff    inet 172.17.0.3/16 scope global eth0       valid_lft forever preferred_lft forever    inet 172.17.0.8/32 scope global eth0       valid_lft forever preferred_lft forever    inet6 fe80::42:acff:fe11:3/64 scope link       valid_lft forever preferred_lft foreversh-4.1# exit[root@localhost ~]#[root@localhost ~]# docker exec -ti eac75212a3b7 /bin/shsh-4.1# ip addr1: 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 forever4: eth0@if5: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue state UP    link/ether 02:42:ac:11:00:02 brd ff:ff:ff:ff:ff:ff    inet 172.17.0.2/16 scope global eth0       valid_lft forever preferred_lft forever    inet6 fe80::42:acff:fe11:2/64 scope link       valid_lft forever preferred_lft forever

而在docker的web容器中，ip的情況如下，在這兩個docker容器的lo網卡上都綁定了 172.17.0.8 這個VIP

[root@localhost ~]# docker psCONTAINER ID        IMAGE                  COMMAND             CREATED             STATUS              PORTS               NAMES9e52f1b85d79        dockermaster_client1   "sleep 2h"          2 days ago          Up 13 minutes       22/tcp              dockermaster_client1_1ca7970401fa0        dockermaster_web2      "sh local.rc"       2 days ago          Up 13 minutes       22/tcp, 80/tcp      dockermaster_web2_10018316201a0        dockermaster_web1      "sh local.rc"       2 days ago          Up 13 minutes       22/tcp, 80/tcp      dockermaster_web1_1ed93d015bc56        dockermaster_lvs1      "/app/run.sh"       2 days ago          Up 13 minutes       22/tcp, 80/tcp      dockermaster_lvs1_1eac75212a3b7        dockermaster_lvs2      "/app/run.sh"       2 days ago          Up 13 minutes       22/tcp, 80/tcp      dockermaster_lvs2_1[root@localhost ~]# docker exec -ti 0018316201a0 /bin/shsh-4.1# ip addr1: 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    inet 172.17.0.8/32 brd 172.17.0.8 scope global lo:0       valid_lft forever preferred_lft forever    inet6 ::1/128 scope host       valid_lft forever preferred_lft forever8: eth0@if9: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue state UP    link/ether 02:42:ac:11:00:04 brd ff:ff:ff:ff:ff:ff    inet 172.17.0.4/16 scope global eth0       valid_lft forever preferred_lft forever    inet6 fe80::42:acff:fe11:4/64 scope link       valid_lft forever preferred_lft foreversh-4.1# exitexit[root@localhost ~]# docker exec -ti ca7970401fa0 /bin/shsh-4.1# ip addr1: 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    inet 172.17.0.8/32 brd 172.17.0.8 scope global lo:0       valid_lft forever preferred_lft forever    inet6 ::1/128 scope host       valid_lft forever preferred_lft forever10: eth0@if11: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue state UP    link/ether 02:42:ac:11:00:05 brd ff:ff:ff:ff:ff:ff    inet 172.17.0.5/16 scope global eth0       valid_lft forever preferred_lft forever    inet6 fe80::42:acff:fe11:5/64 scope link       valid_lft forever preferred_lft foreversh-4.1#

然後在docker的宿主機上，通過curl 172.17.0.8 就能進行訪問