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8916643b0d
* move CNI install/podman config to build-time * move DNS config to userdata * consolidate apt updates for performance
27 lines
1.1 KiB
Bash
Executable File
27 lines
1.1 KiB
Bash
Executable File
#!/bin/bash
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# Tasks in the Linux userdata can't be executed during AMI builds because they
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# rely on instance-specific data, but they only need to be executed once per
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# instance and not on every provisioning of Nomad
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# Add hostname to /etc/hosts
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echo "127.0.0.1 $(hostname)" | sudo tee --append /etc/hosts
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# Use dnsmasq first and then docker bridge network for DNS resolution
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DOCKER_BRIDGE_IP_ADDRESS=$(/usr/local/bin/sockaddr eval 'GetInterfaceIP "docker0"')
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cat <<EOF > /tmp/resolv.conf
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nameserver 127.0.0.1
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nameserver $DOCKER_BRIDGE_IP_ADDRESS
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EOF
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sudo mv /tmp/resolv.conf /etc/resolv.conf
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# need to get the AWS DNS address from the VPC...
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# this is pretty hacky but will work for any typical case
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MAC=$(curl -s --fail http://169.254.169.254/latest/meta-data/mac)
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CIDR_BLOCK=$(curl -s --fail "http://169.254.169.254/latest/meta-data/network/interfaces/macs/$MAC/vpc-ipv4-cidr-block")
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VPC_DNS_ROOT=$(echo "$CIDR_BLOCK" | cut -d'.' -f1-3)
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echo "nameserver ${VPC_DNS_ROOT}.2" > /tmp/dnsmasq-resolv.conf
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sudo mv /tmp/dnsmasq-resolv.conf /var/run/dnsmasq/resolv.conf
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sudo systemctl restart dnsmasq
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sudo systemctl restart docker
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