一。 回顾之前的分享：
1. 远古时代的 运行方式
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2. 虚拟化方式
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3. 虚拟化技术
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4.虚拟化技术和容器化技术区别
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二。 docker网络
思考几个问题
1. docker如何和本地通讯的？
2. docker之前如何通讯的？
3. docker如何管理网段的？
4.docker如何持久化数据的？
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2.通过veth pair 技术 放到ns1 和 ns2打通通讯
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具体操作如下
[root@localhost ~]# ip netns exec ns1 ip a
1: lo: <loopback>mtu 65536 qdisc noop state DOWN group default qlen 1000</loopback>
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
[root@localhost ~]# ip netns exec ns1 ifup lo
[root@localhost ~]# ip netns exec ns1 ip a
1: lo: <loopback,up,lower_up>mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000</loopback,up,lower_up>
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
[root@localhost ~]# ip netns add ns2
[root@localhost ~]# ip netns ls
ns2
ns1
[root@localhost ~]# ip link add veth-ns1 type veth peer name veth-ns2 生成pair
[root@localhost ~]# ip link
1: lo: <loopback,up,lower_up>mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000</loopback,up,lower_up>
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: ens192: <broadcast,multicast,up,lower_up>mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000</broadcast,multicast,up,lower_up>
link/ether 00:0c:29:05:14:25 brd ff:ff:ff:ff:ff:ff
3: docker0: <broadcast,multicast,up,lower_up>mtu 1500 qdisc noqueue state UP mode DEFAULT group default</broadcast,multicast,up,lower_up>
link/ether 02:42:08:ad:c9:e8 brd ff:ff:ff:ff:ff:ff
8: br-871be8aa7492: <no-carrier,broadcast,multicast,up>mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default</no-carrier,broadcast,multicast,up>
link/ether 02:42:46:95:d9:12 brd ff:ff:ff:ff:ff:ff
22: br-bccee08519bd: <no-carrier,broadcast,multicast,up>mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default</no-carrier,broadcast,multicast,up>
link/ether 02:42:1e:52:32:c6 brd ff:ff:ff:ff:ff:ff
40: veth4170787@if39: <broadcast,multicast,up,lower_up>mtu 1500 qdisc noqueue master docker0 state UP mode DEFAULT group default</broadcast,multicast,up,lower_up>
link/ether 66:65:10:fc:ed:eb brd ff:ff:ff:ff:ff:ff link-netnsid 0
41: veth-ns2@veth-ns1: <broadcast,multicast,m-down>mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000</broadcast,multicast,m-down>
link/ether 22:e6:76:17:ed:23 brd ff:ff:ff:ff:ff:ff
42: veth-ns1@veth-ns2: <broadcast,multicast,m-down>mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000</broadcast,multicast,m-down>
link/ether a2:f3:a1:aa:8b:ec brd ff:ff:ff:ff:ff:ff
[root@localhost ~]# ip link set veth-ns1 netns ns1 把pair排队对应的ns
[root@localhost ~]# ip link set veth-ns2 netns ns2
[root@localhost ~]# ip link
1: lo: <loopback,up,lower_up>mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000</loopback,up,lower_up>
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: ens192: <broadcast,multicast,up,lower_up>mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000</broadcast,multicast,up,lower_up>
link/ether 00:0c:29:05:14:25 brd ff:ff:ff:ff:ff:ff
3: docker0: <broadcast,multicast,up,lower_up>mtu 1500 qdisc noqueue state UP mode DEFAULT group default</broadcast,multicast,up,lower_up>
link/ether 02:42:08:ad:c9:e8 brd ff:ff:ff:ff:ff:ff
8: br-871be8aa7492: <no-carrier,broadcast,multicast,up>mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default</no-carrier,broadcast,multicast,up>
link/ether 02:42:46:95:d9:12 brd ff:ff:ff:ff:ff:ff
22: br-bccee08519bd: <no-carrier,broadcast,multicast,up>mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default</no-carrier,broadcast,multicast,up>
link/ether 02:42:1e:52:32:c6 brd ff:ff:ff:ff:ff:ff
40: veth4170787@if39: <broadcast,multicast,up,lower_up>mtu 1500 qdisc noqueue master docker0 state UP mode DEFAULT group default</broadcast,multicast,up,lower_up>
link/ether 66:65:10:fc:ed:eb brd ff:ff:ff:ff:ff:ff link-netnsid 0
[root@localhost ~]# ip netns exec ns1 ip link
1: lo: <loopback,up,lower_up>mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000</loopback,up,lower_up>
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
42: veth-ns1@if41: <broadcast,multicast>mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000</broadcast,multicast>
link/ether a2:f3:a1:aa:8b:ec brd ff:ff:ff:ff:ff:ff link-netnsid 1
[root@localhost ~]# ip netns exec ns2 ip link
1: lo: <loopback>mtu 65536 qdisc noop state DOWN mode DEFAULT group default qlen 1000</loopback>
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
41: veth-ns2@if42: <broadcast,multicast>mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000</broadcast,multicast>
link/ether 22:e6:76:17:ed:23 brd ff:ff:ff:ff:ff:ff link-netnsid 0
[root@localhost ~]# ip netns exec ns1 ip addr add 192.168.0.11/24 dev veth-ns1 网卡需要加入ip地址
[root@localhost ~]# ip netns exec ns2 ip addr add 192.168.0.12/24 dev veth-ns2
[root@localhost ~]# ip netns exec ns1 ip link
1: lo: <loopback,up,lower_up>mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000</loopback,up,lower_up>
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
42: veth-ns1@if41: <broadcast,multicast>mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000</broadcast,multicast>
link/ether a2:f3:a1:aa:8b:ec brd ff:ff:ff:ff:ff:ff link-netnsid 1
[root@localhost ~]# ip netns exec ns1 ip link set veth-ns1 up
[root@localhost ~]# ip netns exec ns2 ip link set veth-ns2 up
[root@localhost ~]# ip netns exec ns1 ip a 启动ns 执行了up操作后 才会ip
1: lo: <loopback,up,lower_up>mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000</loopback,up,lower_up>
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
42: veth-ns1@if41: <broadcast,multicast,up,lower_up>mtu 1500 qdisc noqueue state UP group default qlen 1000</broadcast,multicast,up,lower_up>
link/ether a2:f3:a1:aa:8b:ec brd ff:ff:ff:ff:ff:ff link-netnsid 1
inet 192.168.0.11/24 scope global veth-ns1
valid_lft forever preferred_lft forever
inet6 fe80::a0f3:a1ff:feaa:8bec/64 scope link
valid_lft forever preferred_lft forever
[root@localhost ~]# ip netns exec ns2 ip a
1: lo: <loopback>mtu 65536 qdisc noop state DOWN group default qlen 1000</loopback>
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
41: veth-ns2@if42: <broadcast,multicast,up,lower_up>mtu 1500 qdisc noqueue state UP group default qlen 1000</broadcast,multicast,up,lower_up>
link/ether 22:e6:76:17:ed:23 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet 192.168.0.12/24 scope global veth-ns2
valid_lft forever preferred_lft forever
inet6 fe80::20e6:76ff:fe17:ed23/64 scope link
valid_lft forever preferred_lft forever
[root@localhost ~]# ip netns exec ns1 ping 192.168.0.12
PING 192.168.0.12 (192.168.0.12) 56(84) bytes of data.
64 bytes from 192.168.0.12: icmp_seq=1 ttl=64 time=0.080 ms
64 bytes from 192.168.0.12: icmp_seq=2 ttl=64 time=0.099 ms
2. docker container 和本地打通
0
3. docker 之前如何通讯
0
4.网络network
0
5. ip 地址不够， 可以增加network 来处理
6.让其他container 加入当前这个网络
docker network connect tomcat-net tomcat01
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