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Unable to add DCD to BIGIQ

We are setting up the data collection device in our environment and unable to add the DCD to BIGIQ

Error: Discovery of BIG-IQ Data Collection Device 192.168.45.230 failed with state POST_FAILED and due to error Master Keys differ between this BIG-IQ and the one you are attempting to discover. Please configure both machines to have the same Master Key.

Verified/updated the Master key BIGIQ and DCD couple of times, but no luck.

Command used for changing the Master Key: modify /sys crypto master-key prompt-for-password

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USER ACCEPTED ANSWER & F5 ACCEPTED ANSWER

Vijay,

the command you have used for resetting the master key is the encrypted key to encrypt and decrypt passphrases in bigip.conf see Working with MasterKeys so i'm not sure that will sort your issue.

For Big-iq the master key is generated when you enter in the passphrase and the only way to change this is to reset the device i.e. which would mean a rebuild. Are the passphrases the same/correct on all the devices? See the following for help: Licensing and Initial Setup

Hope this helps,

N

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Comments on this Answer
Comment made 4 months ago by Vijay22 1

Hey Nathan,

Thanks for the help. I was able to add the DCD to BIGIQ after resetting the master key.

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Comment made 4 months ago by nathan 6546

great news

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Comment made 1 month ago by RiverFish 324

Vijay, did you have to reset to factory default like the article says? Can you restore the UCS after resetting to factory defaults?

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USER ACCEPTED ANSWER & F5 ACCEPTED ANSWER

On the DCD that you want to add, they should issue the following command 'clear-rest-storage -d -l' After that command succeeds, you should go through the BIG-IQ GUI again. Step 5 of the setup is setting the master-key. Once you have completed this step and set the master-key to the same value as the big-iq, then you should be able to join the DCD to the BIG-IQ.

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Comment made 4 months ago by Vijay22 1

Hey Kyle,

Thanks for the help.. It worked and successfully added the DCD to BIGIQ after setting up the master key.

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Comment made 3 months ago by Vijay22 1

Hey kyle,

Added all our BIGIP LTM"s to BIGIQ, but stil have issues monitoring the statistics. I'm trying to collect the statictics through snmp and added the community strings to the F5's and not sure what config is missing.

Error on the host Tab: Stats have not yet been collected for this device.

Error on Statistics Collection Tab: Statistics Collection Agent Version: Not available --- Last collected: Not available

Any suggestions?

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Comment made 1 month ago by pponte 135

Hello Vijay, Did you enable statistics collection?

Go to Devices --> Big IP Devices --> Stats collection status Image Text

You should add your DCD logging node on System --> Data collection device --> Add Services

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USER ACCEPTED ANSWER & F5 ACCEPTED ANSWER

In BIG-IQ, the term "master key" is very confusing since this is not the same master key used thru the tmsh cli. I wish PD would have picked a better term.

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