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7-ignition-files.md

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Ignition files

Create the ignition files once the install-config.yaml file has been created:

openshift-install create ignition-configs \
  --dir=$(readlink -f ~/ocp-clusters/${CLUSTER_NAME})

# They are going to be modified and be served by the NGINX container
cp ~/ocp-clusters/${CLUSTER_NAME}/*.ign ${NGINX_DIRECTORY}

NOTE: The ignition files include certificates that are only valid for 24h

Ignition configs modifications

In order to be able to set static IP addresses for the hosts, it is required to inject the proper configuration (/etc/sysconfig/network-scripts/ifcfg-<interface> & /etc/hostname) via ignition:

create_ifcfg(){
  cat > ${NGINX_DIRECTORY}/${HOST}-eno2 << EOF
DEVICE=eno2
BOOTPROTO=none
ONBOOT=yes
NETMASK=${NETMASK}
IPADDR=${IP}
GATEWAY=${GATEWAY}
PEERDNS=no
DNS1=${DNS}
IPV6INIT=no
EOF

  ENO2=$(cat ${NGINX_DIRECTORY}/${HOST}-eno2 | base64 -w0)
  rm ${NGINX_DIRECTORY}/${HOST}-eno2

  cat > ${NGINX_DIRECTORY}/${HOST}-ifcfg-eno2.json << EOF
{
  "append" : false,
  "mode" : 420,
  "filesystem" : "root",
  "path" : "/etc/sysconfig/network-scripts/ifcfg-eno2",
  "contents" : {
    "source" : "data:text/plain;charset=utf-8;base64,${ENO2}",
    "verification" : {}
  },
  "user" : {
    "name" : "root"
  },
  "group": {
    "name": "root"
  }
}
EOF

  cat > ${NGINX_DIRECTORY}/${HOST}-eno1 << EOF
DEVICE=eno1
BOOTPROTO=none
ONBOOT=no
EOF
  ENO1=$(cat ${NGINX_DIRECTORY}/${HOST}-eno1 | base64 -w0)
  rm ${NGINX_DIRECTORY}/${HOST}-eno1
  cat > ${NGINX_DIRECTORY}/${HOST}-ifcfg-eno1.json << EOF
{
  "append" : false,
  "mode" : 420,
  "filesystem" : "root",
  "path" : "/etc/sysconfig/network-scripts/ifcfg-eno1",
  "contents" : {
    "source" : "data:text/plain;charset=utf-8;base64,${ENO1}",
    "verification" : {}
  },
  "user" : {
    "name" : "root"
  },
  "group": {
    "name": "root"
  }
}
EOF

cat > ${NGINX_DIRECTORY}/${HOST}-hostname << EOF
${CLUSTER_NAME}-${HOST}.${DOMAIN_NAME}
EOF
  HN=$(cat ${NGINX_DIRECTORY}/${HOST}-hostname | base64 -w0)
  rm ${NGINX_DIRECTORY}/${HOST}-hostname
  cat > ${NGINX_DIRECTORY}/${HOST}-hostname.json << EOF
{
  "append" : false,
  "mode" : 420,
  "filesystem" : "root",
  "path" : "/etc/hostname",
  "contents" : {
    "source" : "data:text/plain;charset=utf-8;base64,${HN}",
    "verification" : {}
  },
  "user" : {
    "name" : "root"
  },
  "group": {
    "name": "root"
  }
}
EOF
}

# Disable set hostname via reverse lookup
# Common to all hosts
cat > ${NGINX_DIRECTORY}/hostname-mode << EOF
[main]
hostname-mode=none
EOF
  HM=$(cat ${NGINX_DIRECTORY}/hostname-mode | base64 -w0)
  rm ${NGINX_DIRECTORY}/hostname-mode
  cat > ${NGINX_DIRECTORY}/hostname-mode.json << EOF
{
  "append" : false,
  "mode" : 420,
  "filesystem" : "root",
  "path" : "/etc/NetworkManager/conf.d/hostname-mode.conf",
  "contents" : {
    "source" : "data:text/plain;charset=utf-8;base64,${HM}",
    "verification" : {}
  },
  "user" : {
    "name" : "root"
  },
  "group": {
    "name": "root"
  }
}
EOF

modify_ignition(){
  cp -u ${NGINX_DIRECTORY}/${TYPE}.ign ${NGINX_DIRECTORY}/${HOST}.ign.orig
  jq '.storage.files += [inputs]' ${NGINX_DIRECTORY}/${HOST}.ign.orig ${NGINX_DIRECTORY}/${HOST}-hostname.json ${HOST}-ifcfg-eno1.json ${HOST}-ifcfg-eno2.json ${NGINX_DIRECTORY}/hostname-mode.json > ${NGINX_DIRECTORY}/${HOST}.ign
  rm -f ${NGINX_DIRECTORY}/${HOST}-hostname.json ${HOST}-ifcfg-eno1.json ${HOST}-ifcfg-eno2.json
}

HOST="bootstrap"
TYPE="bootstrap"
IP=${BOOTSTRAP_IP}
create_ifcfg
modify_ignition

TYPE="master"
HOST=master-0
IP=${MASTER0_IP}
create_ifcfg
modify_ignition

HOST=master-1
IP=${MASTER1_IP}
create_ifcfg
modify_ignition

HOST=master-2
IP=${MASTER2_IP}
create_ifcfg
modify_ignition

TYPE="worker"
HOST=worker-0
IP=${WORKER0_IP}
create_ifcfg
modify_ignition

NOTE: I'm 100% sure this whole code block can be improved… any suggestions appreciated :)

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