$ systemctl cat mariadb-extra@.socket
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# /etc/systemd/system/mariadb-extra@.socket
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[Unit]
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Description=MariaDB 10.8.0 database server (socket activation extra port multi-instance %I)
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Documentation=man:mariadbd(8)
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Documentation=https://mariadb.com/kb/en/library/systemd/
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[Socket]
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Service=mariadb@%i.service
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# An "extra" as a descriptor name that means treat these ListenStreams as
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# the same as an extra_port.
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# Ref: https://mariadb.com/kb/en/thread-pool-system-status-variables/#extra_port
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FileDescriptorName=extra
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ListenStream=@mariadb-extra-%I
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ListenStream=/tmp/mysql.sock-extra-%I
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# /etc/systemd/system/mariadb-extra@.socket.d/override.conf
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# Requires SELinux permission:
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# allow init_t user_home_t:sock_file { create setattr write };
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[Socket]
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SocketUser=%I
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SocketGroup=%I
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SocketMode=770
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ProtectHome=false
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ListenStream=
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ListenStream=@mariadb-extra-%I
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ListenStream=/home/%I/mariadb-extra.sock
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