Matrix/Synapse

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https://www.upcloud.com/support/install-matrix-synapse/

Create synapse user and /home/synapse, then follow pip virtualenv steps

# This assumes that Synapse has been installed under the user synapse
# e.g. https://www.upcloud.com/support/install-matrix-synapse/

[Unit]
Description=Synapse Matrix homeserver

[Service]
Type=simple
User=synapse
Group=synapse
WorkingDirectory=/home/synapse/.synapse
ExecStart=/home/synapse/.synapse/bin/synctl start
ExecStop=/home/synapse/.synapse/bin/synctl stop
PIDFile=/home/synapse/.synapse/homeserver.pid
#ExecStart=/usr/bin/python2.7 -m synapse.app.homeserver --config-path=/home/synapse/.synapse/homeserver.yaml --log-config=/etc/synapse/log_config.yaml

[Install]
WantedBy=multi-user.target

Automated LetsEncrypt

create /etc/pki/synapse with permissions to synapse user chmod 600

# cat /usr/local/bin/synapse-renewal-hook 
#!/bin/sh
echo "Letsencrypt renewal hook running..."
echo "RENEWED_DOMAINS=$RENEWED_DOMAINS"
echo "RENEWED_LINEAGE=$RENEWED_LINEAGE"

if grep --quiet "matrix.bibanon.org" <<< "$RENEWED_DOMAINS"; then
  # copy over the certificate for matrix to the pki directory with correct permissions
  cat $RENEWED_LINEAGE/privkey.pem > /etc/pki/synapse/matrix.bibanon.org.key
  cat $RENEWED_LINEAGE/fullchain.pem > /etc/pki/synapse/matrix.bibanon.org.crt
  chown synapse:synapse /etc/pki/synapse/matrix.bibanon.org.key
  chown synapse:synapse /etc/pki/synapse/matrix.bibanon.org.crt
  chmod 600 /etc/pki/synapse/matrix.bibanon.org.key
  chmod 600 /etc/pki/synapse/matrix.bibanon.org.crt
  systemctl restart synapse
  echo "synapse matrix server.pem updated. synapse may need to be restarted."
fi

Also use reverse proxy for easier client access without the port: https://github.com/matrix-org/synapse#using-a-reverse-proxy-with-synapse

https://community.letsencrypt.org/t/how-to-use-certs-in-non-root-services/2690

add it to /etc/sysconfig/certbot , enable certbot-renew service