Munin

Munin是一套Perl撰寫的監控軟件。

安裝

Munin目前已經算成熟，更新幅度不會太大，加上Ubuntu內的版本都還算夠新，可以直接安裝Ubuntu內的版本，節點端只需要安裝munin-node：

sudo apt install -y munin-node; sudo apt clean

伺服器則是安裝munin：

sudo apt install -y munin; sudo apt clean

設定

節點端

節點端的設定只要把4949/tcp打開即可（預設值，在/etc/munin/munin-node.conf內可以修改）。

伺服器端

伺服器端的設定，先將Munin設定為CGI模式（事實上會是FastCGI模式），這需要修改/etc/munin/munin-conf.d/cgi.conf：

graph_strategy cgi
html_strategy cgi
cgiurl_graph /munin-cgi/munin-cgi-graph

接着是修正Ubuntu下的檔案權限：

sudo chown munin:adm /var/log/munin/munin-cgi-graph.log /var/log/munin/munin-cgi-html.log

另外是systemd的設定檔，包含了/lib/systemd/system/munin-cgi-graph.service：

#
[Unit]
Description=Munin CGI Graph FastCGI daemon
After=remote-fs.target

[Service]
ExecStart=/usr/bin/spawn-fcgi -s /var/run/munin/fastcgi-graph.sock -P /var/run/munin/fastcgi-graph.pid -U www-data -u munin -g munin /usr/lib/munin/cgi/munin-cgi-graph
PIDFile=/var/run/munin/fastcgi-graph.pid
Restart=always
RestartSec=1
Type=simple

[Install]
WantedBy=multi-user.target

以及/lib/systemd/system/munin-cgi-html.service：

#
[Unit]
Description=Munin CGI HTML FastCGI daemon
After=remote-fs.target

[Service]
ExecStart=/usr/bin/spawn-fcgi -s /var/run/munin/fastcgi-html.sock -P /var/run/munin/fastcgi-html.pid -U www-data -u munin -g munin /usr/lib/munin/cgi/munin-cgi-html
PIDFile=/var/run/munin/fastcgi-html.pid
Restart=always
RestartSec=1
Type=simple

[Install]
WantedBy=multi-user.target

重讀systemd設定，並且設成開機執行，然後跑起來：

sudo systemctl daemon-reload; sudo systemctl enable munin-cgi-graph.service; sudo systemctl enable munin-cgi-html.service; sudo service munin-cgi-graph.service start; sudo service munin-cgi-html.service start

然後是nginx的設定：

location ^~ /munin-cgi/munin-cgi-graph/ {
    fastcgi_split_path_info ^(/munin-cgi/munin-cgi-graph)(.*);
    fastcgi_param PATH_INFO $fastcgi_path_info;
    fastcgi_pass unix:/var/run/munin/fastcgi-graph.sock;
    include fastcgi_params;
}

location /munin/static/ {
    alias /etc/munin/static/;
}

location /munin/ {
    fastcgi_split_path_info ^(/munin)(.*);
    fastcgi_param PATH_INFO $fastcgi_path_info;
    fastcgi_pass unix:/var/run/munin/fastcgi-html.sock;
    include fastcgi_params;
}

讓nginx重讀設定檔後應該就可以在https://www.example.com/munin/看到內容：

sudo pkill -1 nginx

外部連結

• 官方網站 （英文）