Kubernetes: Configuração dos Pré-Requisitos

= Instalação dos pacotes =

1) Instalando os pacotes necessários

yum update yum -y install lvm2 device-mapper-persistent-data btrfs-progs

= Desabilitando o SELinux =

Verificar primeiro o status

sestatus

Se estiver habilitado

Abra o arquivo /etc/selinux/config e defina disabled

SELINUX=disabled SELINUXTYPE=targeted
 * 1) This file controls the state of SELinux on the system.
 * 2) SELINUX= can take one of these three values:
 * 3)       enforcing - SELinux security policy is enforced.
 * 4)       permissive - SELinux prints warnings instead of enforcing.
 * 5)       disabled - No SELinux policy is loaded.
 * 1) SELINUXTYPE= can take one of these two values:
 * 2)       targeted - Targeted processes are protected,
 * 3)       mls - Multi Level Security protection.

Salve e feche o arquivo.

= Configurando o firewalld =

Habilitando

systemctl enable firewalld

Iniciando

systemctl start firewalld

Criando as regras

firewall-cmd --permanent --zone=public --add-port=22/tcp firewall-cmd --permanent --zone=public --add-port=80/tcp firewall-cmd --permanent --zone=public --add-port=443/tcp firewall-cmd --permanent --zone=public --add-port=6443/tcp firewall-cmd --permanent --zone=public --add-port=10250/tcp firewall-cmd --reload

= Desabilitando o SWAP =

1) Execute o comando para desabilitar o swap

swapoff -a

2) Editar o /etc/fstab e comente as partições de swap


 * 1) /dev/mapper/rhel-swap swap swap defaults 0 0

Salve e feche o fstab

3) Execute o comando

mount -a

= Configuração do Storage =

1) Vamos criar o storage para o Component Pack. Alterar o seu disco, no meu caso /dev/sdb

pvcreate /dev/sdb vgcreate dockerVg /dev/sdb lvcreate -l 95%VG --wipesignatures y -n thinpoolLv dockerVg lvcreate -l 1%VG --wipesignatures y -n thinpoolmetaLv dockerVg

2) E mais alguns passos ... lvconvert -y --zero n -c 512K --thinpool dockerVg/thinpoolLv --poolmetadata dockerVg/thinpoolmetaLv cat > /etc/lvm/profile/dockerVg-thinpoolLv.profile << EOF activation {  thin_pool_autoextend_threshold=80  thin_pool_autoextend_percent=20 }  EOF lvchange --metadataprofile dockerVg-thinpoolLv dockerVg/thinpoolLv lvs -o+seg_monitor mkdir -p /var/lib/docker

Exemplo:

NAME                       MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT ... sdb                           8:16   0   231G  0 disk └─sdb1                        8:17   0   231G  0 part ├─rootvg-lv_var           253:5    0 113.8G  0 lvm  /var ├─rootvg-lv_opt           253:8    0    43G  0 lvm  /opt ├─rootvg-lv_thinpool_tmeta 253:10  0     3G  0 lvm │ └─rootvg-lv_thinpool    253:12   0    70G  0 lvm └─rootvg-lv_thinpool_tdata 253:11  0    70G  0 lvm └─rootvg-lv_thinpool    253:12   0    70G  0 lvm
 * 1) lsblk

Caso o filesytem já esteja criado
Tive um cliente que só entregava discos montados, com os passos abaixo resolveu:

1) Comentar o /etc/fstab


 * 1) /dev/mapper/rootvg-lv_devsdx /dev/sdX xfs defaults 0 2

2) Desmontar volume

umount /dev/sdX

3) remover o logical volume

lvremove /dev/rootvg/lv_devsdx

4) Criar volumes para discos de 80G

lvcreate -L 70g --wipesignatures y -n lv_thinpool rootvg lvcreate -L 3g --wipesignatures y -n lv_thinpoolmeta rootvg

E continuar no item acima E mais alguns passos ...

= Ver também =


 * Mais Artigos sobre Connections
 * HCL Connections: Administrando o Component Pack