Added hosts switch based on /etc/cockroachdb/hosts file existing or not

cockroach.service

 [Unit]
-Description=Cockroach db auto starter
+Description=Cockroach db
 
 [Install]
 WantedBy=multi-user.target
 
 [Service]
-ExecStart=/usr/local/bin/cockroach start --certs-dir=/etc/cockroachdb/certs --store=/var/data/cockroachdb/ --port=26257 --http-port=7005 --logtostderr=ERROR
+ExecStartPre=/bin/bash -c "[[ -f /etc/cockroachdb/hosts ]] && (/bin/systemctl set-environment JOIN_SWITCH="--join="$(cat /etc/cockroachdb/hosts))"
+ExecStart=/usr/local/bin/cockroach start --certs-dir=/etc/cockroachdb/certs \
+ --store=/var/data/cockroachdb/ \
+ --cache=.40 \
+ --max-sql-memory=.30 \
+ --external-io-dir=/tmp/cockroachdb/externalio \
+ --temp-dir=/tmp/cockroachdb/tmp \
+ --port=26257 \
+ --http-port=7005 \
+ --logtostderr=ERROR \
+ --log-dir=/var/logs/cockroachdb \
+ $JOIN_SWITCH
+
 ExecStop=/usr/local/bin/cockroach quit --certs-dir=/etc/cockroachdb/certs
 SyslogIdentifier=cockroachdb
 Restart=always
+RestartSec=10
+StandardOutput=syslog
+StandardError=syslog
 LimitNOFILE=35000