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[Docker] Connecting two containers via OVSCloud/Openstack_K8s_Docker 2021. 2. 24. 16:39
To connect two containers via OVS. 1. Creating a container. terry@ubuntu:~$ sudo docker run -t -i --name container1 alpine Unable to find image 'alpine:latest' locally latest: Pulling from library/alpine ba3557a56b15: Pull complete Digest: sha256:a75afd8b57e7f34e4dad8d65e2c7ba2e1975c795ce1ee22fa34f8cf46f96a3be Status: Downloaded newer image for alpine:latest / # // now we are in a container. let..
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[Docker] installation on Ubuntu 16.04.7 LTSCloud/Openstack_K8s_Docker 2021. 2. 24. 15:48
To test and make a lab for K8s(Kubernetes) - Installation: $ sudo apt install docker.io - Verification: $ sudo docker info terry@ubuntu:~$ sudo apt install docker.io Reading package lists... Done Building dependency tree Reading state information... Done The following additional packages will be installed: bridge-utils cgroupfs-mount containerd pigz runc ubuntu-fan Suggested packages: mountall a..
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OVS(Open Virtual Switch) installation on Ubuntu 16.04.7LTSCloud/Openstack_K8s_Docker 2021. 2. 24. 15:42
To connect Docker containers by OvS - installation : $ sudo apt install -y openvswitch-switch - verification : $ sudo ovs-vsctl show terry@ubuntu:~$ sudo apt install -y openvswitch-switch [sudo] password for terry: Reading package lists... Done Building dependency tree Reading state information... Done The following additional packages will be installed: libpython-stdlib libpython2.7-minimal lib..
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OSPF metric/costProtocols/BGP_OSPF_MPLS_VPN 2021. 2. 16. 23:20
Why 31 cost for R5 on R1? R1#show ip route ospf Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - ..
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OSPF Link-state/Adjacency changesProtocols/BGP_OSPF_MPLS_VPN 2021. 2. 16. 16:46
OSPF has a link-state with neighbors. each state from Down to Full is changed with packets establishing a neighbor. if your OSPF neighbor does not come up to FULL state, you can make the troubleshooting closer by looking for the stuck state. 1. Shutdown each interface on R1, R2, R3 R1(config)#int e 0/0.123 R1(config-subif)#sh R2(config)#int e 0/0.123 R2(config-subif)#sh R3(config)#int e 0/0.123 ..
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The OSPF Packet Types and FlowProtocols/BGP_OSPF_MPLS_VPN 2021. 2. 11. 14:02
Packet Name Type / number Function Hello 1 - Discovering neighbors - Maintaining neighbors Database Description 2 - Summarizing database contents Link state request 3 - Requesting LSAs (detailed DB) Link state update 4 - Updating DB Link state acknowledgment 5 - ACK I got these packet flow after commanding 'clear IP ospf process' on R5 R5#clear ip ospf process Reset ALL OSPF processes? [no]: yes..
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Building OSPF network with EVE-NG (2)Protocols/BGP_OSPF_MPLS_VPN 2021. 2. 11. 00:10
all OPSF nodes are in a specific 'area'. Area 0 is a backbone area. the backbone area is responsible for distributing routing information between non-backbone areas. if you have Area more than one, you should have backbone area. the backbone area should be 0 or 0.0.0.0 (0.0.0.0 is same with 0). you can use the decimal number or IP address format for Area number. R1(config)#router ospf 1 // this ..
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Building OSPF network with EVE-NG (1)Protocols/BGP_OSPF_MPLS_VPN 2021. 2. 9. 18:26
OSPF(Open Shortest Path First) is a link-state routing protocol. OSPF version 2 is for IPv4 and version 3 is for IPv6. OSPF protocol is illustrated from RFC2328. Why OSPF? It is a standard protocol unlike EIGRP(Cisco). almost all network devices support OSPF for a routing protocol. Why no OSPF? OSPF could consume resources such as CPU and RAM but nowadays devices are high-performance so it is no..