ISC DHCP HA on RHEL 7.5 without shared storage

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First of all, a very good day to all.

Newbies here are asking for a question, can I create a High Availability DHCP server without using shared storage? Both server is identical and connected via Metro-E infra (of course in Data Center). And, if RHEL HA are unsuitable for DHCP HA, kindly explain why.

Kindly ask if my information was short or not enough

Thank you for your help,
Regard
New RHEL user with knowledge is no less than a month

SM
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SM Guru 3731 points
18 October 2018 1:44 PM

Hi Syed,

Usually a shared storage pool would commonly be used where application data gets stored and this is uniquely accessed by an active storage node in a cluster pool. Ideally there is a locking mechanism being used in any cluster infra which makes only one node to have read/write access on shared storage, and if active node goes down/fails, then it is the responsibility of the cluster infra to choose an active member and which can gain access to shared storage and continue serving application services. I've not heard of DHCP service being put on a Red Hat HA. Any infra without using shared storage for cluster implementation may not be recommended by Red Hat as it would not be able to maintain data integrity. So, plan and decide on how you wish to get this done..

SM Newbie 10 points
21 October 2018 1:25 PM

Thank you for your reply

From my understanding, shared storage itself must be on a cluster, which mean that anything happen on them, secondary or backup will takeover and enforce fence from that point. Single physical shared storage is single point of failure, after all. From what I have gathered on these past day, the ISC DHCP are capable of doing active-active/active-standby and does not require Red Hat to provide HA. Therefore, this conversation is closed.

Regard, SMA

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