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apt install -y collectd-utils

cat <<-EOF  | tee -a /etc/collectd/collectd.conf

LoadPlugin unixsock
<Plugin unixsock>
        SocketFile "/var/run/collectd-unixsock"
        SocketGroup "collectd"
        SocketPerms "0660"
        DeleteSocket false
</Plugin>
EOF

service collectd restart

collectdctl
collectdctl listval |grep df