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In a setup with 2 kamailios in active/passive with a virtual IP that failovers between them:
sbc01 (active) is handling calls.
sbc02 (passive) is started, and does an initial dialog sync via DMQ
root@sbc01:~# kamctl rpc stats.get_statistics all | grep dialog
"dialog:active_dialogs = 39",
"dialog:early_dialogs = 2",
"dialog:expired_dialogs = 0",
"dialog:failed_dialogs = 583",
"dialog:processed_dialogs = 2527",
root@sbc01:~#
root@sbc02:/etc/kamailio# kamctl rpc stats.get_statistics all | grep dialog
"dialog:active_dialogs = 39",
"dialog:early_dialogs = 0",
"dialog:expired_dialogs = 0",
"dialog:failed_dialogs = 0",
"dialog:processed_dialogs = 0",
root@sbc02:/etc/kamailio#
From that point onwards, as long as sbc01 stays as active, sbc02 stays as passive, and no restarts occur anywhere, the values for dialog metrics in sbc02 will not change and remain as they are, in the previous example, active_dialogs would remain as 39.
This was discovered during some tests from #1591
Setup 2 kamailio instances that replicate dialogs via DMQ.
1- On Kamailio1 put some traffic to have some active dialogs (must call dlg_manage() in routing script for these test calls)
2- Start Kamailio2
3- Compare output of: kamcmd stats.get_statistics dialog: on both nodes.
4- Alter the amount of active dialogs on Kamailio1 (either end some or create new ones).
5- Repeat step 3.
Kamailio1 --> Step5 will have different values from Step3.
Kamailio2 --> Step5 will have exactly the same values from Step3.
dialog:active_dialogs should remain as 0 on Kamailio2, as technically there are no dialogs being handled by that server, it only has information of replicated dialogs and those stats are available in the dlg.stats_active metric.
kamailio -v# kamailio -V
version: kamailio 5.2.0-pre1 (x86_64/linux) 2ecf60-dirty
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144 MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: 2ecf60 -dirty
compiled with gcc 6.3.0
root@sbc02:~# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 9.5 (stretch)
Release: 9.5
Codename: stretch
root@sbc02:~# uname -a
Linux sbc02 4.9.0-8-amd64 #1 SMP Debian 4.9.110-3+deb9u6 (2018-10-08) x86_64 GNU/Linux
root@sbc02:~#
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