amazon ec2: Make fetch-ec2-data more robust
curl does not retry if it is unable to connect to the metadata server. For some reason, when creating a new AMI with a recent nixpkgs, the metadata server would not be available when fetch-ec2-data ran. Switching to wget that can retry even on TCP connection errors solved this problem. I also made the fetch-ec2-data depend on ip-up.target, to get it to start a bit later.
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@ -22,21 +22,22 @@ with lib;
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systemd.services."fetch-ec2-data" =
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{ description = "Fetch EC2 Data";
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wantedBy = [ "multi-user.target" ];
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wantedBy = [ "multi-user.target" "sshd.service" ];
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before = [ "sshd.service" ];
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after = [ "network.target" ];
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wants = [ "ip-up.target" ];
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after = [ "ip-up.target" ];
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path = [ pkgs.curl pkgs.iproute ];
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path = [ pkgs.wget pkgs.iproute ];
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script =
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''
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ip route del blackhole 169.254.169.254/32 || true
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curl="curl --retry 3 --retry-delay 0 --fail"
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wget="wget -q --retry-connrefused -O -"
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echo "setting host name..."
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${optionalString (config.networking.hostName == "") ''
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${pkgs.nettools}/bin/hostname $($curl http://169.254.169.254/1.0/meta-data/hostname)
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${pkgs.nettools}/bin/hostname $($wget http://169.254.169.254/1.0/meta-data/hostname)
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''}
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# Don't download the SSH key if it has already been injected
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@ -44,7 +45,7 @@ with lib;
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if ! [ -e /root/.ssh/authorized_keys ]; then
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echo "obtaining SSH key..."
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mkdir -p /root/.ssh
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$curl -o /root/key.pub http://169.254.169.254/1.0/meta-data/public-keys/0/openssh-key
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$wget http://169.254.169.254/1.0/meta-data/public-keys/0/openssh-key > /root/key.pub
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if [ $? -eq 0 -a -e /root/key.pub ]; then
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if ! grep -q -f /root/key.pub /root/.ssh/authorized_keys; then
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cat /root/key.pub >> /root/.ssh/authorized_keys
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@ -58,7 +59,7 @@ with lib;
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# Extract the intended SSH host key for this machine from
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# the supplied user data, if available. Otherwise sshd will
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# generate one normally.
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$curl http://169.254.169.254/2011-01-01/user-data > /root/user-data || true
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$wget http://169.254.169.254/2011-01-01/user-data > /root/user-data || true
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key="$(sed 's/|/\n/g; s/SSH_HOST_DSA_KEY://; t; d' /root/user-data)"
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key_pub="$(sed 's/SSH_HOST_DSA_KEY_PUB://; t; d' /root/user-data)"
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if [ -n "$key" -a -n "$key_pub" -a ! -e /etc/ssh/ssh_host_dsa_key ]; then
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