active_nodes and matchclass

Hi Naman,

What does your node_main datagroup contain? Is it IP addresses or IP addresses and ports? Can you run 'b class node_main list' to show the contents?

I'm not sure what the difference between active_nodes and active_members is. They seem to return the same output.

active_nodes -list will return a TCL list of the IP address and port for each member. You could save this output and then loop through it and compare the IP address and/or port to the contents of your node_main datagroup:

 
 when RULE_INIT { 
  
     Create a list (instead of a datagroup) for testing 
    set ::node_main [list \ 
       "1.1.1.1" \ 
       "2.1.1.1" \ 
       "3.1.1.1" \ 
    ] 
 } 
 when CLIENT_ACCEPTED { 
  
     Compare active_nodes output with active_members 
    log local0. "\[active_nodes -list \[LB::server pool\]\]: [active_nodes -list [LB::server pool]]" 
    log local0. "\[\[llength active_nodes -list \[LB::server pool\]\]\]: [llength [active_nodes -list [LB::server pool]]]" 
  
    log local0. "\[active_members -list \[LB::server pool\]\]: [active_members -list [LB::server pool]]" 
    log local0. "\[\[llength active_members -list \[LB::server pool\]\]\]: [llength [active_members -list [LB::server pool]]]" 
  
     Save the active members to a TCL list 
    set members [active_members -list [LB::server pool]] 
  
     Loop through the list and look up the IP address in the node_main "datagroup" 
    foreach a_member $members { 
  
       log local0. "Checking \$a_member: $a_member, [lindex $a_member 0]" 
  
        Get the IP address from the "IP port" list item and compare it against the node_main datagroup 
       if {[matchclass [lindex $a_member 0] eq $::node_main]}{ 
          log local0. "Found $a_member in node_main datagroup" 
  
           Found match, so exit foreach loop 
          break 
       } 
    } 
 } 
 

Here is an example which checks the port as well:

 
 when RULE_INIT { 
  
     Create a list (instead of a datagroup) for testing 
    set ::node_main [list \ 
       "1.1.1.1:80" \ 
       "2.1.1.1:80" \ 
       "3.1.1.1:80" \ 
       "10.41.135.3:80" \ 
    ] 
 } 
 when CLIENT_ACCEPTED { 
  
     Compare active_nodes output with active_members 
    log local0. "\[active_nodes -list \[LB::server pool\]\]: [active_nodes -list [LB::server pool]]" 
    log local0. "\[\[llength active_nodes -list \[LB::server pool\]\]\]: [llength [active_nodes -list [LB::server pool]]]" 
  
    log local0. "\[active_members -list \[LB::server pool\]\]: [active_members -list [LB::server pool]]" 
    log local0. "\[\[llength active_members -list \[LB::server pool\]\]\]: [llength [active_members -list [LB::server pool]]]" 
  
     Save the active members to a TCL list 
    set members [active_members -list [LB::server pool]] 
  
     Loop through the list and look up the IP address and port in the node_main "datagroup" 
    foreach a_member $members { 
  
        Use string map to replace the space in the list element with a colon 
       log local0. "Checking \$a_member: $a_member, [string map {" " :} $a_member]" 
  
       if {[matchclass [string map {" " :} $a_member] eq $::node_main]}{ 
          log local0. "Found [string map {" " :} $a_member] in node_main datagroup" 
  
           Found match, so exit foreach loop 
          break 
       } 
    } 
 } 
 

Aaron

Hey Aaron,

 

 

Thanks for that. My node_maintain was just a list of IPs so your first solution was spot on!

 

 

Cheers,

 

Naman

For those that want to use active_members -list command. Please note that "-list" option was added in 9.4.2.

 

 

CB