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<title>HAProxy Simple Usage ｜ 回风舞雪</title>
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No introduce, no advanced usage, also no tutor for how to install, just config to implement proxy.
The case there is so easy so you can get sense of achivement quickly.
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<h2><a href='/posts/haproxy-simple-usage/'>HAProxy Simple Usage</a></h2>
<span class="date">2019.08.24</span>
</div>
<div class="post_content markdown"><blockquote>
<p>Reference:
<a href="http://cbonte.github.io/haproxy-dconv/1.9/configuration.html#2.5">http://cbonte.github.io/haproxy-dconv/1.9/configuration.html#2.5</a></p>
</blockquote>
<p>No introduce, no advanced usage, also no tutor for how to install, just config to implement proxy.</p>
<p>The case there is so easy so you can get sense of achivement quickly.</p>
<h1 id="my-goal">My Goal</h1>
<p>If I type <code>ssh username@127.0.0.1 -p80</code> at vps1(127.0.0.1), it’ll connect to vps2(123.123.123.123:22)!</p>
<h1 id="conditions">Conditions</h1>
<ol>
<li>vps1’s port 80 is open</li>
<li>vps2’s port 22 is open</li>
<li>haproxy was installed in vps1(127.0.0.1)</li>
</ol>
<h1 id="configuration">Configuration</h1>
<div class="highlight"><pre class="chroma"><code class="language-fallback" data-lang="fallback">global
log /dev/log local0
log /dev/log local1 notice
chroot /var/lib/haproxy
stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners
stats timeout 30s
user haproxy
group haproxy
daemon
# Default SSL material locations
ca-base /etc/ssl/certs
crt-base /etc/ssl/private
# See: https://ssl-config.mozilla.org/#server=haproxy&server-version=2.0.3&config=intermediate
ssl-default-bind-ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
ssl-default-bind-ciphersuites TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256
ssl-default-bind-options no-sslv3 no-tlsv10 no-tlsv11 no-tls-tickets
defaults
log global
mode http
# option httplog
# option dontlognull
timeout connect 5000
timeout client 50000
timeout server 50000
errorfile 400 /etc/haproxy/errors/400.http
errorfile 403 /etc/haproxy/errors/403.http
errorfile 408 /etc/haproxy/errors/408.http
errorfile 500 /etc/haproxy/errors/500.http
errorfile 502 /etc/haproxy/errors/502.http
errorfile 503 /etc/haproxy/errors/503.http
errorfile 504 /etc/haproxy/errors/504.http
frontend tcp-33-front
bind *:33
mode tcp
default_backend tcp-33-back
backend tcp-33-back
mode tcp
server tcp-33 123.123.123.123:22 check
listen test
bind *:80
mode tcp
server centos 123.123.123.123:22 check port 22 inter 5000 fall 5
</code></pre></div><p>Then, run the command below to verify the syntex is right.</p>
<div class="highlight"><pre class="chroma"><code class="language-fallback" data-lang="fallback">haproxy -f /etc/haproxy/haproxy.cfg -c
</code></pre></div><p>No error occur, yeap, run it!</p>
<div class="highlight"><pre class="chroma"><code class="language-fallback" data-lang="fallback">haproxy -f /etc/haproxy/haproxy.cfg
</code></pre></div><p>Now, you can run <code>ssh -p33 vagrant@127.0.0.1</code> or <code>ssh -p80 vagrant@127.0.0.1</code> to connect to vps2(123.123.123.123) on ssh:22.</p>
<h1 id="simple-working-principle">Simple Working Principle</h1>
<p>This is core config:</p>
<div class="highlight"><pre class="chroma"><code class="language-fallback" data-lang="fallback">frontend tcp-33-front
bind *:33
mode tcp
default_backend tcp-33-back
backend tcp-33-back
mode tcp
server tcp-33 123.123.123.123:22 check
listen test
bind *:80
mode tcp
server centos 123.123.123.123:22 check port 22 inter 5000 fall 5
</code></pre></div><p>also, you can just use one part of it!</p>
<p>listen style: All data access to port 80 will pass to 22!</p>
<div class="highlight"><pre class="chroma"><code class="language-fallback" data-lang="fallback">listen test
bind *:80
mode tcp
server centos 123.123.123.123:22 check port 22 inter 5000 fall 5
</code></pre></div><p>OR</p>
<p>All data access to port 33 will pass to 22!</p>
<div class="highlight"><pre class="chroma"><code class="language-fallback" data-lang="fallback">frontend tcp-33-front
bind *:33
mode tcp
default_backend tcp-33-back
backend tcp-33-back
mode tcp
server tcp-33 123.123.123.123:22 check
</code></pre></div><p>haproxy process look up: <code>ps -ef | grep haproxy</code> .</p>
<h1 id="bind-ports">Bind ports!</h1>
<p>Reference: <a href="http://cbonte.github.io/haproxy-dconv/1.8/configuration.html#bind">http://cbonte.github.io/haproxy-dconv/1.8/configuration.html#bind</a></p>
<blockquote>
<p>It is possible to specify a list of address:port combinations delimited by
commas. There is no
fixed limit to the number of addresses and ports which can be listened on in
a frontend, as well as there is no limit to the number of “bind” statements
in a frontend.</p>
</blockquote>
<p>SO, YOU CAN WRITE frontend like this:</p>
<div class="highlight"><pre class="chroma"><code class="language-fallback" data-lang="fallback">bind :33, :44
bind 10.0.0.1:55, 10.0.0.1:66
</code></pre></div><p>EOF</p></div>
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