Linux

Hi guys and girls, I am so sorry for this long time. It was really awesome how Alpine Linux is. I have tried in my home lab to make some different ntp server on my different vm on different proxmox hypervisors. I have tried OpenNTPd. Unfortunately I was not able to make it works. My Cisco switches cry with :

.Apr 16 21:56:47.016: NTP: rcv packet from 10.20.0.3 to 10.20.0.252 on Vlan200:
.Apr 16 21:56:47.016:  leap 3, mode 2, version 3, stratum 2, ppoll 64
.Apr 16 21:56:47.016:  rtdel 0328 (12.329), rtdsp 0000 (0.000), refid 5242284F (82.66.40.79)
.Apr 16 21:56:47.016:  ref EBAA89A0.323EAFFF (21:55:12.196 CET Wed Apr 16 2025)
.Apr 16 21:56:47.016:  org EBAA89FF.049EF92D (21:56:47.018 CET Wed Apr 16 2025)
.Apr 16 21:56:47.016:  rec EBAA89FD.D3E977FF (21:56:45.827 CET Wed Apr 16 2025)
.Apr 16 21:56:47.016:  xmt EBAA89FD.D3E9C7FF (21:56:45.827 CET Wed Apr 16 2025)
.Apr 16 21:56:47.016:  inp EBAA89FF.056B27F5 (21:56:47.021 CET Wed Apr 16 2025)
.Apr 16 21:56:47.016: NTP: packet from 10.20.0.3 failed validity tests 20
.Apr 16 21:56:47.016: Peer/Server Clock unsynchronized

And :

You probably already have this warning and think you have correctly installed php8.X-imagick. You check lot of times, but don’t search how to remove it.

Try this :

# apt-get install libmagickcore-6.q16-6-extra

For one time this blog post will not be around Telecom and Cisco/Juniper/Nokia or something like this.

Just to keep in mind how to replace a faulty device in a ZFS pool.

I have :

root@pve:~# zpool status -x
root@pve:~#  zpool status
  pool: pve-zfs
 state: DEGRADED
status: One or more devices could not be used because the label is missing or
        invalid.  Sufficient replicas exist for the pool to continue
        functioning in a degraded state.
action: Replace the device using 'zpool replace'.
   see: http://zfsonlinux.org/msg/ZFS-8000-4J
  scan: resilvered 41.9M in 0 days 00:00:11 with 0 errors on Sun Jul 24 13:38:51 2022
config:

        NAME                        STATE     READ WRITE CKSUM
        pve-zfs                     DEGRADED     0     0     0
          mirror-0                  DEGRADED     0     0     0
            wwn-0x50014ee267b78b52  ONLINE       0     0     0
            2534239155907356895     FAULTED      0     0     0  was /dev/sdb1
          mirror-1                  ONLINE       0     0     0
            wwn-0x50014ee267b63342  ONLINE       0     0     0
            wwn-0x50014ee2bd0cf6b4  ONLINE       0     0     0

errors: No known data errors

But how to replace this faulty device when all the howto on the net talk about replace/make offline the old disk… But in my situation I have made an RMA on the disk and don’t have mind to make the faulty device offline.

Perhaps it seems easy for you, but it was not for me at begining even if I am running bind9 master/bind9 slave already.

We will begin with TSIG key, on your master DNS server :

root@Sagitarius:~# tsig-keygen mykey > /etc/bind/keys/mykey.key
root@Sagitarius:~# cat /etc/bind/keys/mykey.key
key "mykey" {
        algorithm hmac-sha256;
        secret "+OyXk+FYgsnE6Lei59Qi2LPsctRHPaqcYRpftG4YXKk=";
};
root@Sagitarius:~# 

Now we will configure this on my “named.conf.local” file as :

root@Sagitarius:/etc/bind# cat named.conf.local 
[...]
//On indique la clé à utiliser et son algorithme de chiffrement
include "/etc/bind/keys/mykey.key";

//On indique l'adresse IP du serveur "Esclave"
server 192.168.1.81
{
        keys { mykey; };
};
[...]
zone "my-blah-zone.fr" {
       type master;
       file "/etc/bind/my-blah-zone.fr.zone";
       allow-transfer { 192.168.1.81; key mykey; };
       notify yes;
};
[...]

Ok. last command :

For those of you which update your personal cloud to the lastest stable version of Nextcloud due to CVE (https://www.cert.ssi.gouv.fr/avis/CERTFR-2021-AVI-543/), you could encountered this error :

An unhandled exception has been thrown:
OC\HintException: [0]: Memcache \OC\Memcache\APCu not available for local cache (Is the matching PHP module installed and enabled?)

You could solve the issue :

echo 'apc.enable_cli=1' >> /etc/php/7.x/mods-available/apcu.ini

Have fun.

diff -urpN bwping/bwping.c bwping-patched/bwping.c
--- bwping/bwping.c     2012-10-11 19:23:17.000000000 +0200
+++ bwping-patched/bwping.c     2017-04-20 09:06:23.449540033 +0200
@@ -26,6 +26,7 @@
 #include 
 #include 
 #include 
+#include 
 
 #ifdef __CYGWIN__
 #include "cygwin.h"
@@ -224,21 +225,39 @@ static int recv_ping (int sock, int iden
         return 0;
     }
 }
+unsigned int   transmitted_number, received_number;
+unsigned long  int received_volume;
+struct timeval begin, end;
+
+void sig_handler(int signo)
+{
+       if (signo == SIGUSR1) {
+                printf("Total: pkts sent/rcvd: %u/%u, volume rcvd: %lu bytes, time: %d sec, speed: %lu kbps, rtt min/max/average: %llu/%llu/%llu ms\n",
+                               transmitted_number, received_number, received_volume, (int)(end.tv_sec - begin.tv_sec),
+                               end.tv_sec - begin.tv_sec?((received_volume / (end.tv_sec - begin.tv_sec)) * 8) / 1000:(received_volume * 8) / 1000,
+                               min_rtt==DEF_MIN_RTT?0:min_rtt, max_rtt, average_rtt);
+               exit(255);
+       }
+}
 
 int main (int argc, char **argv)
 {
     int                    sock, exitval, ch, ident, finish, pktburst, i, n;
- unsigned int           bufsize, tos, transmitted_number, received_number;
- unsigned long int      kbps, pktsize, volume, rperiod, received_volume;
+    unsigned int           bufsize, tos;
+    unsigned long int      kbps, pktsize, volume, rperiod;
     unsigned long long int min_interval, interval, current_interval, integral_error;
     char                   *ep, *bind_addr, *target;
     fd_set                 fds;
     struct sockaddr_in     bind_to, to;
     struct hostent         *hp;
- struct timeval         begin, end, report, start, now, seltimeout;
+    struct timeval         report, start, now, seltimeout;
 
     sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
 
+       if (signal(SIGUSR1, sig_handler) == SIG_ERR)
+               printf("\ncan't catch SIGUSR1\n");
+
+
     if (sock==-1) {
         perror("bwping: socket(AF_INET, SOCK_RAW, IPPROTO_ICMP) failed");

Download : patch-bwping-sig.diff

It may possible you are face off the problem to synchronize some other items in your GUI when you delete a row in your jqgrid.

You can use this tip to do it :

var myDelOptions = {
    onclickSubmit: function(options, rowid) {
          var grid_id = $.jgrid.jqID($( "#tip" )[0].id),
             grid_p = $( "#tip" )[0].p,
             newPage = grid_p.page;

          // reset the value of processing option which could be modified
          options.processing = true;

          // delete the row
          $( "#tip" ).delRowData(rowid);
          $.ajax({
                url: 'backend/ip.php',
                type: 'POST',
                data : 'oper=del&id=' + rowid,
                dataType: "text",
                success: function(data, status, xr) {
                         $( "#troute" ).trigger("reloadGrid");
                         $( "#tip" ).trigger("reloadGrid");
                },
                error: function(e) {
                         //called when there is an error
                         //console.log(e.message);
                }
           });
           
           $.jgrid.hideModal("#delmod"+grid_id,
                             {gb:"#gbox_"+grid_id,
                              jqm:options.jqModal,onClose:options.onClose});

           if (grid_p.lastpage > 1) {// on the multipage grid reload the grid
                    if (grid_p.reccount === 0 && newPage === grid_p.lastpage) {
                        // if after deliting there are no rows on the current page
                        // which is the last page of the grid
                        newPage--; // go to the previous page
                     }
                     // reload grid to make the row from the next page visable.
                     $( "#tip" ).trigger("reloadGrid", [{page:newPage}]);
            }

            return true;
     },
     processing:true
}; // fin variable

 $("#tip").jqGrid({
     url: "backend/ip.php",
     datatype: "xml",
     mtype: "GET",
     colNames: [" ", "Prefix", "Longueur", "Device"],
     colModel: [
                { name: 'myac', width:80, fixed:true, sortable:false, resize:false,
                  formatter:'actions', formatoptions:{editbutton: false, onedit:null,
                  delbutton:true, delOptions: myDelOptions}},
                { name: "prefix", width: 125, align: "center" },
                { name: "longueur", width: 100, align: "center" },
                { name: "device", width: 75, align: "center" }
      ],
      [...]
      caption: "Affectation IP / Intf"
});

[...]

The great thing is that you are able to make some data / gui treatment. Here I make a data update by means of a jquery ajax call and update jqgrids by means of two trigger(“reloadGrid”) calls.

For those of you which perform some Aurora Tango tests (BERT, RFC 2544) you may know that a couple of these testers are really expensive ! The principle of these test is to place a tester in loopback and another is test mode. By means of this, you are able to qualify an Ethernet link (direct, Q-in-Q, VPLS, Xconnect).

During my readings of mailing-lists such as cisco-nsp or others, someone posts an URL to a really awesome Linux program : etherate. With modern CPU platform you are able to supply a throughput until 1G, and this program give you the possibility to test your L2 circuits.

It is been a while I check forums and Ubiquiti products. They are really good products. At the beginning the really interesting thing in ubiquiti was the Open minded / Open Source direction they used. I begun to use their product with SR and XR card (when they don’t seek any final products). It was really easy to make your own product firmware with an embedded MIPS motherboard and their cards. The SDK was available at this time.

To make a point :

 

export CFLAGS=-static
export LDFLAGS=-static
export CPPFLAGS=-static
export CFLAGS_APPEND=-static
export LDFLAGS_APPEND=-static
export CPPFLAGS_APPEND=-static

./configure && make