first pass at boot script
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Content-Type: multipart/mixed; boundary="==BOUNDARY=="
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MIME-Version: 1.0
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--==BOUNDARY==
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Content-Type: text/x-shellscript; charset="us-ascii"
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#!/bin/bash
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# Run Order: 1
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# Run Frequency: only once, on first boot
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# Tasks:
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# - Install Dependencies
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# - Make users and directories
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# - Install download, unzip, and setup vault bin
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# Note: dollar-sign curly braces are template values from Terraform.
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# Non curly brace ones are normal bash variables...
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yum update -y
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yum install -y jq
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# Make the user
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useradd --system --shell /sbin/nologin vault
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# Make the directories
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mkdir -p "/opt/vault"
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mkdir -p "/opt/vault/bin"
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mkdir -p "/opt/vault/config"
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# Give corret permissions
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chmod 755 "/opt/vault"
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chmod 755 "/opt/vault/bin"
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# Change ownership to vault user
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chown -R "vault:vault" "/opt/vault"
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# Download the vault bin
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curl -o /tmp/vault.zip https://releases.hashicorp.com/vault/${VAULT_VERSION}/vault_${VAULT_VERSION}_linux_amd64.zip
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# unzip it in the /tmp dir
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unzip -d /tmp /tmp/vault.zip
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# move it to the /opt/vault/bin dir
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mv /tmp/vault /opt/vault/bin
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# give ownership to the vault user
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chown vault:vault /opt/vault/bin
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# create a symlink
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ln -s /opt/vault/bin/vault /usr/local/bin/vault
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# allow vault permissions to use mlock and prevent memory from swapping to disk
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setcap cap_ipc_lock=+ep /opt/vault/bin/vault
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--==BOUNDARY==
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Content-Type: text/x-shellscript; charset="us-ascii"
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#!/bin/bash
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# Run Order: 2
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# Run Frequency: only once, on first boot
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# Tasks:
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# - Make the vault config file
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# - Make the systemd service file
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# The vault config file
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cat > /opt/vault/config/server.hcl <<- EOF
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cluster_name = ${VAULT_CLUSTER_NAME}
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max_lease_ttl = "192h" # One week
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default_lease_ttl = "192h" # One week
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ui = "true"
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# Where can the Vault API be reached? At the load balancer.
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api_addr = ${VAULT_LOAD_BALANCER_DNS}
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# For forwarding between vault servers. Set to own ip.
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cluster_addr = "http://INSTANCE_IP_ADDR:8201"
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# Auto unseal the vault
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seal "awskms" {
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region = ${VAULT_CLUSTER_REGION}
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kms_key_id = ${VAULT_KMS_KEY}
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}
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listener "tcp" {
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address = "0.0.0.0:8200"
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cluster_address = "0.0.0.0:8201"
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# off, because they all talk in a private subnet
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tls_disable = "true"
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}
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storage "dynamodb" {
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ha_enabled = "true"
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region = ${VAULT_CLUSTER_REGION}
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table = ${VAULT_DYNAMODB_TABLE}
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}
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EOF
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chwon vault:vault /opt/vault/config/server.hcl
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# The systemd service file
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cat > /etc/systemd/system/vault.service <<- EOF
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[Unit]
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Description=Vault Server on AWS
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Requires=network-online.target
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After=network-online.target
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[Service]
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User=vault
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Group=vault
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ProtectSystem=full
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ProtectHome=read-only
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PrivateTmp=yes
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PrivateDevices=yes
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SecureBits=keep-caps
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AmbientCapabilities=CAP_IPC_LOCK
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Capabilities=CAP_IPC_LOCK+ep
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CapabilityBoundingSet=CAP_SYSLOG CAP_IPC_LOCK
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NoNewPrivileges=yes
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ExecStart=/opt/vault/bin/vault server -config /opt/vault/config/ -log-level=info
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ExecReload=/bin/kill --signal HUP \$MAINPID
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KillMode=process
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KillSignal=SIGINT
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Restart=on-failure
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RestartSec=5
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TimeoutStopSec=30
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StartLimitInterval=60
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StartLimitBurst=3
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LimitNOFILE=65536
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[Install]
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WantedBy=multi-user.target
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EOF
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--==BOUNDARY==
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Content-Type: text/x-shellscript; charset="us-ascii"
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#!/bin/bash
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# Run Order: 3
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# Run Frequency: only once, on first boot
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# Tasks:
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# - Replace values in configuration files with instance metadata
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# - Start vault
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INSTANCE_IP_ADDR=$(curl http://169.254.169.254/latest/meta-data/local-ipv4)
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sed -i -e "s/INSTANCE_IP_ADDR/$INSTANCE_IP_ADDR/g" /opt/vault/config/server.hcl
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systemctl daemon-reload
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systemctl enable vault
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systemctl restart vault
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--==BOUNDARY==
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Content-Type: text/x-shellscript; charset="us-ascii"
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#!/bin/bash
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# Run Order: 4
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# Run Frequency: only once, on first boot
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# Tasks:
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# - Initialize Vault
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# - Create credentials file
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# - Encrypt the file via KMS
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# - Send the file to S3
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# - Erase bash history
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--==BOUNDARY==--
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