containerlab学习笔记二 srl01实例测试

containerlab 是一个使用容器技术构建虚拟网络平台的系统，类似于packet tracer，不过没有图形界面，更加轻量。

本文主要记录学习containerlab的第一个实验 srl01 搭建一个主机。

运行srl01

查看配置文件

more srl01.clab.yml

name: srl01

topology:
  kinds:
    srl:
      type: ixrd3
      image: ghcr.io/nokia/srlinux
  nodes:
    srl:
      kind: srl

简单说明：
name 拓扑名称
kinds 定义类型，这里定义了一个srl(srlinux)类型
nodes 拓扑有哪些类型，这里只有一个srl类型

部署配置文件

containerlab deploy -t ./srl01.clab.yml 

INFO[0001] Containerlab v0.44.3 started                 
INFO[0002] Parsing & checking topology file: srl01.clab.yml 
INFO[0002] Creating docker network: Name="clab", IPv4Subnet="172.20.20.0/24", IPv6Subnet="2001:172:20:20::/64", MTU="1500" 
WARN[0002] Unable to load kernel module "ip_tables" automatically "load ip_tables failed: exec format error" 
INFO[0002] Creating lab directory: /root/containerlab/lab-examples/srl01/clab-srl01 
WARN[0003] SSH_AUTH_SOCK not set, skipping pubkey fetching 
INFO[0003] Creating container: "srl"                    
INFO[0005] Running postdeploy actions for Nokia SR Linux 'srl' node 
INFO[0084] Adding containerlab host entries to /etc/hosts file 
+---+----------------+--------------+-----------------------+------+---------+----------------+----------------------+
| # |      Name      | Container ID |         Image         | Kind |  State  |  IPv4 Address  |     IPv6 Address     |
+---+----------------+--------------+-----------------------+------+---------+----------------+----------------------+
| 1 | clab-srl01-srl | 0d2e3356aaf5 | ghcr.io/nokia/srlinux | srl  | running | 172.20.20.2/24 | 2001:172:20:20::2/64 |
+---+----------------+--------------+-----------------------+------+---------+----------------+----------------------+

这里可以看到 部署了一个linux容器，id 是 0d2e3356aaf5 有一个IP地址 172.20.20.2

docker ps

CONTAINER ID   IMAGE                   COMMAND                  CREATED         STATUS         PORTS     NAMES
0d2e3356aaf5   ghcr.io/nokia/srlinux   "/tini -- fixuid -q …"   9 minutes ago   Up 9 minutes             clab-srl01-srl

这个IP地址使用的是宿主机的 虚拟网桥的网段，这个地址仅仅用于和宿主机通信，并没有什么实际用途。

5: br-229c075377f7: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
    link/ether 02:42:9d:bd:29:08 brd ff:ff:ff:ff:ff:ff
    inet 172.20.20.1/24 brd 172.20.20.255 scope global br-229c075377f7
       valid_lft forever preferred_lft forever
    inet6 2001:172:20:20::1/64 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::42:9dff:febd:2908/64 scope link 
       valid_lft forever preferred_lft forever
    inet6 fe80::1/64 scope link 
       valid_lft forever preferred_lft forever

进入容器查看：

docker exec -it 0d2e3356aaf5  bash

[root@srl /]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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
2: dummy-mgmt0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether f2:e8:db:8b:7d:49 brd ff:ff:ff:ff:ff:ff
    inet 172.20.20.2/24 brd 172.20.20.255 scope global dummy-mgmt0
       valid_lft forever preferred_lft forever
    inet6 2001:172:20:20::2/64 scope global 
       valid_lft forever preferred_lft forever
3: gway-2800@if3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether ba:d2:11:c8:cc:55 brd ff:ff:ff:ff:ff:ff link-netns srbase-mgmt
    inet6 fe80::b8d2:11ff:fec8:cc55/64 scope link 
       valid_lft forever preferred_lft forever
5: monit_in@if4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9234 qdisc noqueue state UP group default qlen 1000
    link/ether 4e:ea:4f:ce:62:14 brd ff:ff:ff:ff:ff:ff link-netns monit
    inet6 fe80::4cea:4fff:fece:6214/64 scope link 
       valid_lft forever preferred_lft forever
6: mgmt0@if7: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1514 qdisc noqueue state UP group default 
    link/ether 02:42:ac:14:14:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
7: mgmt0-0@if4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 1a:8b:28:f0:74:1f brd ff:ff:ff:ff:ff:ff link-netns srbase-mgmt
    inet6 fe80::188b:28ff:fef0:741f/64 scope link 
       valid_lft forever preferred_lft forever

dummy-mgmt0 虚拟的网卡对应了IP地址172.20.20.2
这里注意到这个网卡还没有被UP起来，可以用ip命令up网卡：

ip link set dummy-mgmt0 up

现在就可以ping通本地的地址了：

ping 172.20.20.2

PING 172.20.20.2 (172.20.20.2) 56(84) bytes of data.
64 bytes from 172.20.20.2: icmp_seq=1 ttl=64 time=0.032 ms
64 bytes from 172.20.20.2: icmp_seq=2 ttl=64 time=0.048 ms
^C
--- 172.20.20.2 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1026ms
rtt min/avg/max/mdev = 0.032/0.040/0.048/0.008 ms