====== Configuração inicial ======
===== Pacotes essenciais =====
<code bash>
$ su -
# apt update
# apt install vim wget curl git sudo accountsservice sudo \
lvm2 open-vm-tools build-essential jq \
bash-completion apt-transport-https ca-certificates gnupg2
</code>

===== Configuração de Usuário =====

<code bash>
# usermod -aG sudo suporte
</code>

===== VIM =====
[[vimrc|vimrc]]

===== Rede =====
<code bash>
$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug ens192
iface ens192 inet static
        address 177.75.176.40/27
        gateway 177.75.176.33

iface ens192 inet6 static
        address 2804:694:3000:8000::40/64
        gateway 2804:694:3000:8000::
        # dns-* options are implemented by the resolvconf package, if installed
        dns-nameservers 177.75.176.25 2804:694:4c00:4001::1
        dns-search juntotelecom.com.br
</code>

<code bash>
$ sudo hostnamectl set-hostname kube-ctrl-pl-01.juntotelecom.com.br
</code>

===== NTP =====
<code bash>
$ sudo timedatectl set-time '2022-05-05 15:30:00'
</code>

<code bash>
$ sudo timedatectl set-timezone America/Sao_Paulo
</code>

<code bash>
$ timedatectl status
               Local time: ter 2022-04-05 15:31:30 -03
           Universal time: ter 2022-04-05 18:31:30 UTC
                 RTC time: ter 2022-04-05 18:31:30
                Time zone: America/Sao_Paulo (-03, -0300)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no
</code>

<code bash>
$ sudo apt update
$ sudo apt install chrony
</code>

<code bash>
$ sudo vim /etc/chrony/chrony.conf
[...]
#pool 2.debian.pool.ntp.org iburst
pool pool.ntp.br iburst
[...]
</code>

<code bash>
$ sudo timedatectl set-ntp true
</code>

<code bash>
$ sudo systemctl restart chronyd
</code>

<code bash>
$ chronyc sources -v

  .-- Source mode  '^' = server, '=' = peer, '#' = local clock.
 / .- Source state '*' = current best, '+' = combined, '-' = not combined,
| /             'x' = may be in error, '~' = too variable, '?' = unusable.
||                                                 .- xxxx [ yyyy ] +/- zzzz
||      Reachability register (octal) -.           |  xxxx = adjusted offset,
||      Log2(Polling interval) --.      |          |  yyyy = measured offset,
||                                \     |          |  zzzz = estimated error.
||                                 |    |           \
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^- b.ntp.br                      2   6    17    24   -186us[ -186us] +/-   45ms
^? a.st1.ntp.br                  0   7     0     -     +0ns[   +0ns] +/-    0ns
^? gps.jd.ntp.br                 0   7     0     -     +0ns[   +0ns] +/-    0ns
^? c.ntp.br                      0   7     0     -     +0ns[   +0ns] +/-    0ns
^? a.ntp.br                      0   7     0     -     +0ns[   +0ns] +/-    0ns
^* a.ntp.br                      2   6    17    26   +303us[  -54us] +/- 3343us
^? b.ntp.br                      0   7     0     -     +0ns[   +0ns] +/-    0ns
^- c.ntp.br                      2   6    17    25  +1166us[+1166us] +/-   38ms
</code>

<code bash>
$ chronyc tracking
Reference ID    : C8A00008 (a.ntp.br)
Stratum         : 3
Ref time (UTC)  : Tue Apr 05 18:35:49 2022
System time     : 0.000000057 seconds fast of NTP time
Last offset     : -0.000357560 seconds
RMS offset      : 0.000357560 seconds
Frequency       : 26.038 ppm fast
Residual freq   : -24.961 ppm
Skew            : 0.250 ppm
Root delay      : 0.002586446 seconds
Root dispersion : 0.003777417 seconds
Update interval : 0.8 seconds
Leap status     : Normal
</code>

<code bash>
$ chronyc sourcestats
Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std Dev
==============================================================================
b.ntp.br                    5   5    71    +13.665     80.742  +1093us   104us
a.st1.ntp.br                0   0     0     +0.000   2000.000     +0ns  4000ms
gps.jd.ntp.br               0   0     0     +0.000   2000.000     +0ns  4000ms
c.ntp.br                    0   0     0     +0.000   2000.000     +0ns  4000ms
a.ntp.br                    0   0     0     +0.000   2000.000     +0ns  4000ms
a.ntp.br                    5   3    70     -2.523     42.783    -68us   238us
b.ntp.br                    0   0     0     +0.000   2000.000     +0ns  4000ms
c.ntp.br                    5   3    71     -0.930      6.718  +1140us    25us
</code>