檢視 Vault/Install 的原始碼

'''Vault/Install'''將介紹[[Vault]]的安裝與設定。

== 安裝 ==

Vault是單執行檔，建議安裝的路徑是<code>/usr/local/bin/vault</code>，這點沒有在官方的文件裡提到，但官方的範例常使用這個路徑<ref name="ops-deployment-guide">{{Cite web |url=https://learn.hashicorp.com/vault/day-one/ops-deployment-guide |title=Vault Deployment Guide |accessdate=2020-07-15 |language=en}}</ref>。

以Linux版的例子來說：

<syntaxhighlight lang="bash">
cd /tmp; wget -c https://releases.hashicorp.com/vault/1.4.3/vault_1.4.3_linux_amd64.zip; unzip vault_1.4.3_linux_amd64.zip; sudo cp vault /usr/local/bin/vault; sudo chmod 755 /usr/local/bin/vault
</syntaxhighlight>

== 設定KMS、DynamoDB與IAM ==

=== DynamoDB ===

建立一個表格（這邊叫<code>vault</code>），依照官方的設計：

* Primary partition key設為<code>Path</code>（string）。
* Primary sort key設為<code>Key</code>（string）。

量很少時可以考慮使用on-demand模式按照讀寫的量計費，而非以保證讀寫的容量計費。

=== KMS ===

使用<code>SYMMETRIC_DEFAULT</code>建立即可。

=== IAM ===

建立使用者並且產生對應的AWS key（<code>access_key</code>與<code>secret_key</code>）。

接著掛入對應的Inline Policy <code>Policy-Vault-DynamoDB</code>，需要修改帳戶編號（這邊是<code>123456789012</code>）與DynamoDB的表格名稱部份（這邊是<code>vault</code>）：

<syntaxhighlight lang="json">
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": [
                "dynamodb:BatchGetItem",
                "dynamodb:BatchWriteItem",
                "dynamodb:PutItem",
                "dynamodb:DescribeTable",
                "dynamodb:DeleteItem",
                "dynamodb:GetItem",
                "dynamodb:Scan",
                "dynamodb:ListTagsOfResource",
                "dynamodb:Query",
                "dynamodb:UpdateItem",
                "dynamodb:DescribeTimeToLive",
                "dynamodb:GetRecords"
            ],
            "Resource": [
                "arn:aws:dynamodb:ap-southeast-1:123456789012:table/vault/stream/*",
                "arn:aws:dynamodb:ap-southeast-1:123456789012:table/vault/index/*",
                "arn:aws:dynamodb:ap-southeast-1:123456789012:table/vault"
            ]
        },
        {
            "Sid": "VisualEditor1",
            "Effect": "Allow",
            "Action": [
                "dynamodb:DescribeReservedCapacityOfferings",
                "dynamodb:ListTables",
                "dynamodb:DescribeReservedCapacity",
                "dynamodb:DescribeLimits"
            ],
            "Resource": "*"
        }
    ]
}
</syntaxhighlight>

以及<code>Policy-Vault-KMS</code>，需要修改帳戶編號（這邊是<code>123456789012</code>）與KMS的Key ID部份（UUID格式，這邊是<code>01234567-89ab-cdef-0123-456789abcdef</code>）：

<syntaxhighlight lang="json">
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": [
                "kms:Decrypt",
                "kms:Encrypt",
                "kms:DescribeKey"
            ],
            "Resource": "arn:aws:kms:ap-southeast-1:123456789012:key/01234567-89ab-cdef-0123-456789abcdef"
        }
    ]
}
</syntaxhighlight>

== 建立系統的使用者 ==

建立<code>vault</code>使用者：

<syntaxhighlight lang="bash">
sudo groupadd -r vault; sudo useradd -g vault -r vault
</syntaxhighlight>

== 設定vault.hcl ==

先建立對應的路徑：

<syntaxhighlight lang="bash">
sudo mkdir /etc/vault.d; sudo touch /etc/vault.d/vault.hcl; sudo chown vault:vault /etc/vault.d/vault.hcl; sudo chmod 600 /etc/vault.d/vault.hcl
</syntaxhighlight>

Vault的設定檔建議的路徑是<code>/etc/vault.d/vault.hcl</code>，這點沒有在官方的文件裡提到，但官方的範例常使用這個路徑<ref name="ops-deployment-guide"/>。需要修改自己的網路位置（這邊使用<code>10.10.10.10</code>）。

<syntaxhighlight lang="nginx">
api_addr = "http://10.10.10.10:8200"
cluster_addr = "http://10.10.10.10:8201"
log_level = "Info"
ui = true

listener "tcp" {    
  address         = "0.0.0.0:8200"
  cluster_address = "10.10.10.10:8201"
  tls_disable     = "true"
}

seal "awskms" {
  region     = "ap-southeast-1"
  access_key = "x"
  secret_key = "x"
  kms_key_id = "x"
}

storage "dynamodb" {
  ha_enabled = "true"
  region     = "ap-southeast-1"
  table      = "vault"
  access_key = "x"
  secret_key = "x"
}
</syntaxhighlight>

如果是把機器放在AWS內部的話，可以用EC2 Role的方式，就不需要在設定檔內指定<code>access_key</code>與<code>secret_key</code>，Vault會自己去內部網路的<code>169.254.169.254</code>裡抓EC2 Role提供的權限。

== 設定systemd相關設定 ==

放到<code>/lib/systemd/system/vault.service</code>：

<syntaxhighlight lang="ini">
[Unit]
Description="HashiCorp Vault - A tool for managing secrets"
Documentation=https://www.vaultproject.io/docs/
Requires=network-online.target
After=network-online.target
ConditionFileNotEmpty=/etc/vault.d/vault.hcl
StartLimitIntervalSec=60
StartLimitBurst=3

[Service]
User=vault
Group=vault
ProtectSystem=full
ProtectHome=read-only
PrivateTmp=yes
PrivateDevices=yes
SecureBits=keep-caps
AmbientCapabilities=CAP_IPC_LOCK
Capabilities=CAP_IPC_LOCK+ep
CapabilityBoundingSet=CAP_SYSLOG CAP_IPC_LOCK
NoNewPrivileges=yes
ExecStart=/usr/local/bin/vault server -config=/etc/vault.d/vault.hcl
ExecReload=/bin/kill --signal HUP $MAINPID
KillMode=process
KillSignal=SIGINT
Restart=on-failure
RestartSec=5
TimeoutStopSec=30
StartLimitInterval=60
StartLimitIntervalSec=60
StartLimitBurst=3
LimitNOFILE=65536
LimitMEMLOCK=infinity

[Install]
WantedBy=multi-user.target
</syntaxhighlight>

然後設定開機啟動，並且馬上啟動：

<syntaxhighlight lang="bash">
sudo systemctl daemon-reload; sudo systemctl enable vault; sudo service vault start
</syntaxhighlight>

== 初始化 ==

第一次執行時需要初始化，在其中一台機器執行：

<syntaxhighlight lang="bash">
vault operator init -recovery-shares=1 -recovery-threshold=1 -address=http://127.0.0.1:8200
</syntaxhighlight>

這邊會產生root token讓使用者操作。

== 設定ELB ==

這邊建議用ALB：

* 使用ACM管理HTTPS所需要的憑證。
* 使用<code>/v1/sys/health</code>的狀態設定health check，只有active node會傳回200<ref>{{Cite web |url=https://www.vaultproject.io/api/system/health.html |title=/sys/health - HTTP API |accessdate=2020-07-17 |language=en}}</ref>。

== 檢修 ==

把<code>vault.hcl</code>內的<code>log_level</code>改為<code>Debug</code>後，可以在<code>/var/log/syslog</code>看到不少資訊。

== 參考文獻 ==

{{Reflist|2}}

== 相關連結 ==

* [[Vault]]

== 外部連結 ==

* {{Official|https://www.vaultproject.io/}} {{en}}

[[Category:軟體]]