NSX ALB (Avi Networks) HTTP policy set removal

     As I wrote on some of my previous posts, Lets Encrypt automation of certs renewal inside NSX ALB (Avi) platform is very useful for Customer environments utilising large number of web oriented services, which needs to be on free HTTPS setup. These blogs about integration could be found here LINK-1 or LINK-2 for DNS based configurations.

    What I saw from some operational systems is that, occasionally, there is small piece left under HTTP policies (for HTTP-01 based challenges), in parent-child setups of virtual services, where HTTP policy is not removed properly from parent virtual service and that prohibits further renewal of certificate when it's needed. Typical removal of that piece is making troubles because it's associated to virtual service and system is not allowing that change.

    What's needed is to de-associate problematic HTTP policy set from virtual service and then it can be freely removed from system without any issue. This can be accomplished in 2 distinct ways - utilising Avi CLI or API call.

    First option is practically easy and could be accomplished by utilising next CLI commands inside Avi controller:

- connect to Avi controller using SSH and open Avi specific shell using "shell" (admin is preconfigured as user for this - or you can use something on your own, if needed);

- you can check problematic virtual service and all HTTP policies attached to it by using command "show virtual service <vs-name>";

- enter virtual service configuration mode "configure virtual service <vs-name>";

- de-associate problematic HTTP policy with command "no http_policies index <output received from previous command in brackets []";

- exit config mode "exit";

- list all HTTP policy sets "show http policyset";

- delete HTTP policy set using "delete httppolicyset <http-policy-set-name-from-previous-command>".

    Second option is useful by utilising API calls using some client (Postman or similar) and code like this in example:

{
"delete" : {
"http_policies": [{
"http_policy_set_ref": "/api/httppolicyset/<http-policy-uuid>",
          "index": 1000001 ###most probably this is going to be index number for LE script integration
- if not change accordingly###
}]
}
}

    Hope this helps for some of your future Lets Encrypt troubleshootings...




Comments

Post a Comment

Popular posts from this blog

NSX ALB LetsEncrypt with DNS-01 challenge - BIND example

    In some of my previous posts, mentioned here LetsEncrypt script integration and Script parameter usage , I explained how useful it can be for NSX advanced load balancing solutions to utilise this kind of approach for free and automatic certificate manipulation, especially in environments with large number of web services inside. This approach utilises HTTP-01 based challenge with LetsEncrypt systems and L7 HTTP/S virtual services on NSX ALB side.     Now, from some time ago there is enhancement in this area, developed by official Avi Networks devops page, in terms of using DNS-01 challenge also. I tried on-prem option using Bind DNS as server which works very well.     Steps are pretty much similar to HTTP-01 option, which can be summarised as following:      - Create L7 virtual service with publicly available FQDN - certificates resolved can be in both options RSA or ECDSA, as configured during creation;        - Do...
Read more

VMware SD WAN - multiple locations - LAN IP address space overlapping with NAT

Image
     Different scenarios are possible in terms of routing, NAT-ing and IP overlapping setups using VMware Velocloud SD WAN technology in Customer environments.      Recently I had an PoC with my Customer for the on-prem option with this VMware solution, where different use cases were interesting to show and demonstrate - one of them is something I would like to share and it relates to possibility of LAN-side NAT on Edge (branch) locations, with purpose to have IP overlapped on these setups. Next picture is showing typical Hub&Spoke setup where it can be possible to make this type of configuration: Picture 1. VMware SD WAN lab on-prem environment     Basically thing which needs to be accomplished is appropriate NAT solution for LANs on every branch Edge which are and needs to be the same (192.168.1.0/24 in this example) - as it is shown on Picture 1.      Honestly speaking, NAT is not one of so powerful things insi...
Read more

NSX-T Layer 2 bridging - scenarios & use cases

Image
     Layer 2 bridging is very useful feature of NSX-T, which provides connection to a VLAN backed port group or a device, such as a gateway, that resides outside of NSX-T DC environment. Useful scenarios, among others, are: Workload migration from VLAN-backed to NSX overlay segment, NSX-V to NSX-T migration in Customer environments, Security features leverage using NSX-T Gateway firewall etc. L2 bridging feature requires usage of Edge clusters and Edge Bridge profiles.      Deployments should consider different options, with most important scenarios, for implementation below (this covers Edge VM deployment option as typical use case): Edge VM on VSS portgroup  --> promiscuous and forged transmit on portgroup REQUIRED / ESXi host (with Edge VM) command " esxcli system settings advanced set -o /Net/ReversePathFwdCheckPromisc -i 1 " REQUIRED / Active and Standby Edge VMs should be on different hosts, Edge VM on VDS 6.6 (or later) portgroup  -->...
Read more