MariaDB/Mysql Timezone

By default, mysql timezone value is system. It causes Python application error. After changed timezone to UTC, problem is solved.

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KVM access guest from outside host on CentOS

For default virbr0, it provides a way to help guest to access host (VM<–>host). But the guest cannot be accessed from outside host. But we can use the following commands to enable it temporally.

# iptables -D  FORWARD -o virbr0 -j REJECT --reject-with icmp-port-unreachable
# iptables -D  FORWARD -i virbr0 -j REJECT --reject-with icmp-port-unreachable
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