CentOS 7.x Cloudstack 4.11 Register ISO

To install fresh OS using CD/DVD ISO, it needs to be registered with cloudstack. To register an ISO use following steps:

Cloudstack can take ISO from a public URL or also from a local server. For local server we can upload OS ISO to local http server and give its path. To allow local access use following:
1. Go to Global Settings and edit "secstorage.allowed.internal.sites" to have comma separated list of local HTTP servers which host ISOs. Example list is 192.168.1.50/32.
2. After this on each management server do:
```
systemctl restart cloudstack-management
```
Again login to CloudStack management UI
Navigate to ‘Templates’ and select view ‘ISO’ from the drop-down list
Click ‘Register ISO'
Set ‘Name’ and ‘Description’ fields
Set the URL to the nearest ISO mirror or local server
Select appropriate zone name
Check the ‘Bootable’ checkbox
Set the OS Type field
Select Extractable (Downloadable), Public (Accessible to others), Featured (Shows on featured tab), etc. appropriately.
Click OK button to start the download
Wait for the ISO download and complete registration successfully. It takes a few minutes depending on the speed of your connection

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