OK, let me better explain my problem. I've to provide a kind of "HA" application for Wialon Local, so I've installed a second Wialon Local according to the instruction and also the wialon storage backup.
when I try to turn on this installation something fails (of course the main wialon is powerd off), I can access to the backend but there is no way to activate the service: cms and portal.
I was lucky one time that after the 3rd update (the same update for 3 times) the system start.
but I can't have a stable situation and I can't find in the log any clear indication of the failure.
for example searching in the logs from the last test I found these:
Jun 17 17:17:35 wialon-local kernel: [ 31.098884] adf_service: segfault at 101e71529 ip 00007f715944004e sp 00007fff1b8dce68 error 4 in libc-2.24.so[7f71593bc000+195000]
2020/06/17 17:17:21 [error] 586#586: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 10.35.1.28, server: 10.35.1.61, request: "POST /avl_evts HTTP/1.1", upstream: "http://127.0.0.1:8022/avl_evts", host: "10.35.1.61:8025", referrer: "http://10.35.1.61:8025/wialon/post.html"
supposing there is a broken update I try probably 5 times to apply the 516MB of update, but at the end the result was unchanged.