Contenedores Solaris

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Categoría: Solaris
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En este artículo explico como conseguir una zona de Solaris 11 intentando utilizar la menor cantidad de recursos posibles. Para ello, utilizo la red y los sistemas de ficheros de la zona global, y no arranco los servicios SMF. 

Primero configuro una zona normal, que servirá para establecer las ganancias posteriores.

Defino una variable con el nombre de la zona por comodidad

# export ZONENAME=zone1

Configuro la zona

# zonecfg -z ${ZONENAME}
create -b
set brand=solaris
set ip-type=shared
add net
set address=192.168.170.253/24
set physical=vlan170
end
commit
exit

Ahora, en vez de instalar con los valores por defecto, aprovecho para ir recortando espacio y servicios, en el manifest y el config de la zona

# vi mainfest.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE auto_install SYSTEM "file:///usr/share/install/ai.dtd.1">
<auto_install>
    <ai_instance name="zone_default">
        <target>
            <logical>
                <zpool name="rpool">
                    <be name="zbe">
                        <options>
                            <option name="compression" value="on"/>
                        </options>
                    </be>
                </zpool>
            </logical>
        </target>
        <software type="IPS">
            <software_data action="install">
                <name>core-os</name>
            </software_data>
        </software>
    </ai_instance>
</auto_install>

 

# vi config.xml
<?xml version='1.0' encoding='US-ASCII'?>
<!DOCTYPE service_bundle SYSTEM "/usr/share/lib/xml/dtd/service_bundle.dtd.1">
<!-- Auto-generated by sysconfig -->
<service_bundle name="sysconfig" type="profile">
  <service name="system/identity" type="service" version="1">
    <instance enabled="true" name="cert"/>
    <instance enabled="true" name="node">
      <property_group name="config" type="application">
        <propval name="nodename" type="astring" value="solaris"/>
      </property_group>
    </instance>
  </service>
  <service name="system/name-service/cache" type="service" version="1">
    <instance enabled="true" name="default"/>
  </service>
  <service name="system/name-service/switch" type="service" version="1">
    <property_group name="config" type="application">
      <propval name="default" type="astring" value="files"/>
    </property_group>
    <instance enabled="true" name="default"/>
  </service>
  <service name="system/keymap" type="service" version="1">
    <instance enabled="true" name="default">
      <property_group name="keymap" type="application">
        <propval name="layout" type="astring" value="Spanish"/>
      </property_group>
    </instance>
  </service>
  <service name="system/environment" type="service" version="1">
    <instance enabled="true" name="init">
      <property_group name="environment" type="application">
        <propval name="LANG" type="astring" value="C"/>
      </property_group>
    </instance>
  </service>
  <service name="system/timezone" type="service" version="1">
    <instance enabled="true" name="default">
      <property_group name="timezone" type="application">
        <propval name="localtime" type="astring" value="UTC"/>
      </property_group>
    </instance>
  </service>
  <service name="system/config-user" type="service" version="1">
    <instance enabled="true" name="default">
      <property_group name="root_account" type="application">
        <propval name="password" type="astring" value="$5$rounds=10000$lDL4x5q8$IlHsdf·Re3f$·iP5AAK8Jj6YF/wnigr$·"d9O825MC"/>
        <propval name="type" type="astring" value="normal"/>
        <propval name="login" type="astring" value="root"/>
      </property_group>
    </instance>
  </service>
</service_bundle>

Instalación de la zona

# zoneadm -z ${ZONENAME} install -m manifest.xml -c config.xml
The following ZFS file system(s) have been created:
    rpool/VARSHARE/zones/zone1
Progress being logged to /var/log/zones/zoneadm.20200304T094644Z.zone1.install
       Image: Preparing at /system/zones/zone1/root.

 Install Log: /system/volatile/install.14837/install_log
 AI Manifest: /tmp/manifest.xml.KwahVa
  SC Profile: /usr/share/auto_install/sc_profiles/enable_sci.xml
    Zonename: zone1
Installation: Starting ...

        Creating IPS image
Startup linked: 1/1 done
        Installing packages from:
            solaris
                origin:  http://pkg.gestio.sys/oracle/
DOWNLOAD                                PKGS         FILES    XFER (MB)   SPEED
Completed                            306/306   47432/47432  327.0/327.0  6.5M/s

PHASE                                          ITEMS
Installing new actions                   66258/66258
Updating package state database                 Done 
Updating package cache                           0/0 
Updating image state                            Done 
Creating fast lookup database                   Done 
Updating package cache                           1/1 
Installation: Succeeded
 done.

        Done: Installation completed in 248.885 seconds.


  Next Steps: Boot the zone, then log into the zone console (zlogin -C)

              to complete the configuration process.

Log saved in non-global zone as /system/zones/zone1/root/var/log/zones/zoneadm.20200304T094644Z.zone1.install

Vemos lo que ocupa (Solo el paquete core-os, que es lo mínimo que podemos instalar)

# du -sh /system/zones/${ZONENAME}  
 717M   /system/zones/zone1

Hacemos un primer arranque para que configure los servicios

# zoneadm -z ${ZONENAME} boot

Instalamos apache

# zlogin ${ZONENAME} pkg install apache-24
# zlogin ${ZONENAME} svcadm enable apache24

Vemos los procesos arrancados y los recursos utilizados:

# ptree -z ${ZONENAME}
17019 zsched
  17093 /usr/sbin/init
17101 /lib/svc/bin/svc.startd
  17507 /usr/sbin/ttymon -g -d /dev/console -l console -m ldterm,ttcompat -h -p solaris console login: 
17103 /lib/svc/bin/svc.configd
17177 /usr/sbin/sysobjd -d 0 -b 300 -t 300 -n 5
17191 /lib/crypto/kcfd
17202 /usr/lib/pfexecd
17224 /usr/lib/utmpd
17232 /sbin/sh /lib/svc/method/net-ipmgmt start
  17233 sleep 3600
17265 /lib/svc/bin/svc.periodicd
17270 /usr/lib/rad/rad -sp
17361 /usr/lib/zones/zoneproxy-client -s localhost:1008
17375 /usr/sbin/rpcbind -w
17389 /usr/lib/fm/fmd/fmd
17437 /usr/sbin/cron
17443 /usr/lib/inet/inetd start
17463 /usr/lib/sstore/bin/sstored --events --repo-path /var/share/sstore/repo --max-repo-size 2048
17471 /usr/sbin/nscd
17489 /usr/sbin/syslogd
17537 /usr/lib/sstore/bin/sysstatd --max-process-size=268435456
17577 /usr/apache2/2.4/bin/httpd -k start
  17578 /usr/apache2/2.4/bin/httpd -k start
  17579 /usr/apache2/2.4/bin/httpd -k start
  17580 /usr/apache2/2.4/bin/httpd -k start
# zonestat 5
Collecting data for first interval...
Interval: 1, Duration: 0:00:05
SUMMARY                   Cpus/Online: 8/8   PhysMem: 8192M  VirtMem: 9215M
                    ----------CPU---------- --PhysMem-- --VirtMem-- --PhysNet--
               ZONE  USED %PART  STLN %STLN  USED %USED  USED %USED PBYTE %PUSE
            [total]  0.01 0.14%  0.00 0.00% 2442M 29.8% 2602M 28.2%  2576 0.00%
           [system]  0.00 0.02%  0.00 0.00% 1858M 22.6% 1926M 20.8%     -     -
             global  0.00 0.10%     -     -  351M 4.29%  431M 4.68%  2576 0.00%
              zone1  0.00 0.01%     -     -  232M 2.83%  244M 2.65%     0 0.00%

Apagamos la zona

# zoneadm -z ${ZONENAME} halt

Lo primero que vamos a hacer es desahabilitar el SMF y arrancamos directamente el Apache:

# echo "run::sysinit:/etc/rc.local >/dev/msglog 2>&1 </dev/console" > /system/zones/${ZONENAME}/root/etc/inittab

# vi /system/zones/${ZONENAME}/root/etc/rc.local
#!/bin/bash

zfs mount rpool/VARSHARE
ZONENAME=$(zoneadm list)
zoneadm -z ${ZONENAME} mark -a goals-online
/usr/apache2/2.4/bin/httpd -DFOREGROUND -k start
zoneadm -z ${ZONENAME} mark -a goals-maintenance

# chmod +x /system/zones/${ZONENAME}/root/etc/rc.local

En el script de arranque (rc.local), tenemos que montar el /var/share para poder utilizar el comando zoneadm. Con el comando zoneadm marcamos que la zona ha llegado al estado goals-online con lo que el servicio denominado svc:/system/zones/zone:${ZONENAME} de la zona global pasa al estado online. 

# zoneadm -z ${ZONENAME} boot

# ptree -z ${ZONENAME}
18387 zsched
  18461 /usr/sbin/init
    18463 /bin/bash /etc/rc.local
      18473 /usr/apache2/2.4/bin/httpd -DFOREGROUND -k start
        18474 /usr/apache2/2.4/bin/httpd -DFOREGROUND -k start
        18475 /usr/apache2/2.4/bin/httpd -DFOREGROUND -k start
        18476 /usr/apache2/2.4/bin/httpd -DFOREGROUND -k start


# zonestat 5
Collecting data for first interval...
Interval: 1, Duration: 0:00:05
SUMMARY                   Cpus/Online: 8/8   PhysMem: 8192M  VirtMem: 9215M
                    ----------CPU---------- --PhysMem-- --VirtMem-- --PhysNet--
               ZONE  USED %PART  STLN %STLN  USED %USED  USED %USED PBYTE %PUSE
            [total]  0.00 0.10%  0.00 0.00% 2216M 27.0% 2357M 25.5%  2188 0.00%
           [system]  0.00 0.02%  0.00 0.00% 1849M 22.5% 1906M 20.6%     -     -
             global  0.00 0.08%     -     -  351M 4.29%  432M 4.69%  2188 0.00%
              zone1  0.00 0.00%     -     - 15.3M 0.18% 18.1M 0.19%     0 0.00%

Ahora vemos que hay muchos menos procesos ejecutaádose en la zona, y la memoria a disminuido considerablemente. 

Ahora podemos ahorrarnos todo el disco de los binarios, que son exactamente iguales que los de la zona global, para eso montamos los sistemas de ficheros de la zona global (similar a las zonas SMALL de Solaris 10).

Configuramos la zona para montar /usr, /lib y /platform de la zona global:

# zonecfg -z ${ZONENAME}
add fs
set dir=/usr
set special=/usr
set type=lofs
add options ro
end
add fs
set dir=/lib
set special=/lib
set type=lofs
add options ro
end
add fs
set dir=/platform
set special=/platform
set type=lofs
add options ro
end
commit 
exit

Borramos los ficheros de la zona:

# rm -rf /system/zones/${ZONENAME}/root/usr/* /system/zones/${ZONENAME}/root/lib/* /system/zones/${ZONENAME}/root/platform/*

Vemos que se ha liberado el espacio:

# du -sh /system/zones/${ZONENAME}  
 144M   /system/zones/zone1

Por último podemos borrar los snapshots de la instalación:

# zfs destroy -r rpool/VARSHARE/zones/${ZONENAME}/rpool/ROOT/zbe@install