Problem occurred during launching ansible playbook to install OpenStack

[fzj]

Hello, everyone. I am a Software Engineering student from China. My English is not very good so I would try my best to make myself clear.
I have been following the guidance from https://github.com/cmusatyalab/elijah-openstack to install openstack++, but whenever I execute

ansible-playbook -i ./hosts openstack-kilo.yaml

I always got this error

TASK [openstack-common : (OS-COMMON) update cache and perform upgrade] *********
fatal: [localhost]: FAILED! => {"changed": false, "failed": true, "msg": "Failed to update apt cache."}

Weird thing is: I have succeeded before (about several days ago) with the same steps. But after I reinstalled Ubuntu 14.04 system, I always got the error above.

I have tried sudo rm -vf /var/lib/apt/lists/* and sudo apt-get update, but it didn't work for me .
What's more, when I was installing Ansible using

$ apt-get install software-properties-common
$ apt-add-repository -y ppa:ansible/ansible
$ apt-get update
$ apt-get install -y ansible git

After the third step (apt-get update), I got some Hash Sum mismatch like this:

W: Failed to fetch http://ppa.launchpad.net/ansible/ansible/ubuntu/dists/trusty/main/i18n/Translation-en Hash Sum mismatch

E: Some index files failed to download. They have been ignored, or old ones used instead.

Not sure if that has something to do with the "Failed to update apt cache " error.
I have been running this on a physical machine, with
Ububtu 14.04
RAM: 4GB
CPU: Intel Core i3-2310M CPU @ 2.10GHz * 4
OS type: 64-bit
Disk: 740 GB
I have been stuck for days, any help will be appreciated!

[teiszler]

@fzj,

It is possible there is some connectivity issues with the repository for the PPA. I tried it on my one machine just now and it initially said it could not locate ppa:ansible/ansible, but when i tried it a few seconds later it added it without issue. If you remove the ansible PPA with apt-add-repository -r ppa:ansible/ansible, and then do apt-get update, does the update succeed? If that works, you might try adding the repository again and retrying the update (you can do these steps manually first without executing the ansible playbook)

Regards,
Tom

[fzj]

@teiszler
Thanks for your prompt reply!
I have tried several times. Every time I removed the ansible PPA and do apt-get update again just like you said, it always succeeded. But when I added the repository again and update, the Hush Sum Mismatch error occurred every time.
Maybe it has something to do with the GFW of China or just my Internet connection issue?

[fzj]

UPDATE:
I tried the same thing on my classmates' PCs and they both succeeded. We are in the same Wi-Fi enviroment. I guess this is a machine issue, maybe I have reinstalled so many times that broke something within? That's so weird...
I prepare to install openstack++ on a new machine and see what will happen.

[fzj]

@teiszler Hi,Tom.
Can you apt-get update successfully after install Ansible in Ubuntu 14.04?
I can do it in Ububtu 16.04, but not in 14.04. However, 16.04 seemed to have another problem.
I will sincerely appreciate your help.

[teiszler]

@fzj,

I have successfully updated after installing ansible on 14.04. You won't be able to use 16.04 because currently the project requires OpenStack Kilo which will only run on 14.04. Was this after you did a clean install of Ubuntu 14.04? It is interesting that it works just fine from your classmates' machines. This leads me to believe it is something specific to your setup. Is it still failing with the same error (hash sum mismatch)? And do you get the same error when you do apt-get update manually or does it only fail when you execute the ansible playbook?

Regards,
Tom

[fzj]

@teiszler
Really appreciate your reply, sir. I guess this was related to the network environment of my school (maybe beacuse of the firewall or something like this), so I did the apt-get update step at my dorm using another network and did the rest part at school. Seems the problem was resolved.
Thanks for help. Just another question: I am not very sure about these 2 steps:
Step 7. Create the initial private network
Step 8. Create a pool of floating IP addresses
I am using wired connection on my physical machine with static IP 10.131.253.97, so how should I set the fixed-range-v4, fixed-cidr and floating IP address?
Again, many thanks.

[teiszler]

@fzj,

Step 7: This is the internal network for the VMs. You should be able to choose any subnet you like. If you only have a single NIC on your machine, then you can just use the example from the README

nova network-create vmprivate --fixed-range-v4 10.11.12.0/24 --fixed-cidr 10.11.12.0/24 --bridge br100 --bridge-interface veth1

This will create a range from 10.11.12.1 to 10.11.12.255 and these addresses will be handed out by the OpenStack controller to VMs when they are instantiated. You should then be able to click the 'Manage Rules' button of the default security group under the 'Access and Security' pane and add rules to all ping (ICMP) or other tcp/udp traffic. Once you have set up the rules, you should, for instance, be able to ssh into your VMs from your physical machine.

The floating IP addresses are a bit of a different story. These addresses need to be allocated in order for your VMs to be externally accessible. If you have some block of public IP addresses that you can get from your university for example (like the 10.131.253.97 address of your machine), you could create a floating IP range for that block. You can then dynamically assign an IP from that pool to one of the VMs and then it should be able to addressed publicly. Again you need to make sure your security rules allow whatever type of traffic you wish to address on those VMs.

Regards,
Tom

[fzj]

Thanks for your help!