在 Admin Router 前配置 HAProxy

使用 HAProxy 为 DC/OS Admin Router 设置 HTTP 代理

您可以使用 HAProxy 在 DC/OS Admin Router 前设置 HTTP 代理。例如，如果您想向通过 HTTPS 连接到群集的用户代理程序提供自定义服务器证书，这可能非常有用。DC/OS 当前不支持将您自己的证书直接添加到 Admin Router 中。

HTTP 代理必须执行即时 HTTP 请求和响应标头修改，因为 DC/OS 不知道用户代理程序用于寻址 HTTP 代理的自定义主机名和端口。

以下说明提供了经测试的 HAProxy 配置示例，其处理命名请求/响应重写。此示例确保 HAProxy 和 DC/OS Admin Router 之间的通信是 TLS 加密的。

  1. 安装 HAProxy 1.6.9。
  2. 为 DC/OS 创建 HAProxy 配置。本示例适用于 AWS 上的 DC/OS 群集。有关 HAProxy 配置参数的更多信息，请参阅文档。 您可以使用代理 IP 地址 DNS 条目找到您的任务 IP。 
    1. <taskname>.<framework_name>.agentip.dcos.thisdcos.directory
    其中：
    • taskname：任务名称。
    • framework_name：框架名称，如果您不确定，可能 marathon。
    1. global
    2.   daemon
    3.   log 127.0.0.1 local0
    4.   log 127.0.0.1 local1 notice
    5.   maxconn 20000
    6.   pidfile /var/run/haproxy.pid
    7. defaults
    8.   log            global
    9.   option         dontlog-normal
    10.   mode         http
    11.   retries             3
    12.   maxconn          20000
    13.   timeout connect  5000
    14.   timeout client  50000
    15.   timeout server  50000
    17. frontend http
    18.   # Bind on port 9090. HAProxy will listen on port 9090 on each
    19.   # available network for new HTTP connections.
    20.   bind 0.0.0.0:9090
    21.   # Specify your own server certificate chain and associated private key.
    22.   # See https://cbonte.github.io/haproxy-dconv/configuration-1.6.html#5.1-crt
    23.   # bind :9091 ssl crt /path/to/browser-trusted.crt
    24.   #
    25.   # Name of backend configuration for DC/OS.
    26.   default_backend dcos
    28.   # Store request Host header temporarily in transaction scope
    29.   # so that its value is accessible during response processing.
    30.   # Note: RFC 7230 requires clients to send the Host header and
    31.   # specifies it to contain both, host and port information.
    32.   http-request set-var(txn.request_host_header) req.hdr(Host)
    34.   # Overwrite Host header to 'dcoshost'. This makes the Location
    35.   # header in DC/OS Admin Router upstream responses contain a
    36.   # predictable hostname (NGINX uses this header value when
    37.   # constructing absolute redirect URLs). That value is used
    38.   # in the response Location header rewrite logic (see regular
    39.   # expression-based rewrite in the backend section below).
    40.   http-request set-header Host dcoshost
    42. backend dcos
    43.   # Option 1: use TLS-encrypted communication with DC/OS Admin Router and
    44.   # perform server certificate verification (including hostname verification).
    45.   # If you are using the community-supported version of DC/OS, you must
    46.   # configure Admin Router with a custom TLS server certificate, see
    47.   # /2.0/administering-clusters/. This step
    48.   # is not required for DC/OS Enterprise.
    49.   #
    50.   # Explanation for the parameters in the following server definition line:
    51.   #
    52.   # 1.2.3.4:443
    53.   #
    54.   #   IP address and port that HAProxy uses to connect to DC/OS Admin
    55.   #   Router. This needs to be adjusted to your setup.
    56.   #
    57.   #
    58.   # ssl verify required
    59.   #
    60.   #   Instruct HAProxy to use TLS, and to error out if server certificate
    61.   #   verification fails.
    62.   #
    63.   # ca-file dcos-ca.crt
    64.   #
    65.   #   The local file dcos-ca.crt is expected to contain the CA certificate
    66.   #   that Admin Router's certificate will be verified against. It must be
    67.   #   retrieved out-of-band (on Mesosphere DC/OS Enterprise this can be
    68.   #   obtained via https://dcoshost/ca/dcos-ca.crt)
    69.   #
    70.   # verifyhost frontend-xxx.eu-central-1.elb.amazonaws.com
    71.   #
    72.   #   When verifying the TLS certificate presented by DC/OS Admin Router,
    73.   #   perform hostname verification using the hostname specified here
    74.   #   (expect the server certificate to contain a DNSName SAN that is
    75.   #   equivalent to the hostname defined here). The hostname shown here is
    76.   #   just an example and needs to be adjusted to your setup.
    78.   server dcos-1 1.2.3.4:443 ssl verify required ca-file dcos-ca.crt verifyhost frontend-xxx.eu-central-1.elb.amazonaws.com
    80.   # Option 2: use TLS-encrypted communication with DC/OS Admin Router, but do
    81.   # not perform server certificate verification (warning: this is insecure, and
    82.   # we hope that you know what you are doing).
    83.   # server dcos-1 1.2.3.4:443 ssl verify none
    84.   #
    85.   # Rewrite response Location header if it contains an absolute URL
    86.   # pointing to the 'dcoshost' host: replace 'dcoshost' with original
    87.   # request Host header (containing hostname and port).
    88.   http-response replace-header Location https?://dcoshost((/.)?) "http://%[var(txn.request_host_header)]\1&#34;
  3. 使用这些设置启动 HAProxy。