openvpn and static ip

I've installed openvpn on Centos 7 server. My client can connect but I need use a static ip. I 've search many solutions on web but I've not fix the problem.
Beneath you can view my configuration files

Thanks a lot for any suggestions

server.conf
Quote:

proto udp dev tun ca /usr/share/easy-rsa/3.0.7/pki/ca.crt cert /usr/share/easy-rsa/3.0.7/issued/server1.crt key /usr/share/easy-rsa/3.0.7/pki/private/server1.key dh /usr/share/easy-rsa/3.0.7/pki/dh.pem ifconfig-pool-persist ipp.txt push "redirect-gateway def1 bypass-dhcp" push "dhcp-option DNS 8.8.8.8" push "dhcp-option DNS 8.8.4.4" topology subnet remote-cert-eku "TLS Web Client Authentication" tls-auth /usr/share/easy-rsa/3.0.7/pki/private/server1.key 0 keepalive 10 120 cipher AES-256-CBC persist-key persist-tun status openvpn-status.log log /var/log/openvpn.log log-append /var/log/openvpn.log verb 3 explicit-exit-notify 1

client configuration
Quote:

client dev tun proto udp remote xxx.xxx.xxx.xxx 1193 nobind persist-key persist-tun ca ca.crt cert client01.crt key client01.key cipher AES-256-CBC auth SHA512 auth-nocache tls-version-min 1.2 tls-cipher TLS-DHE-RSA-WITH-AES-256-GCM-SHA384:TLS-DHE-RSA-WITH-AES-256-CBC-SHA256:TLS-DHE-RSA-WITH-AES-128-GCM-SHA256:TLS-DHE-RSA-WITH-AES-128-CBC-SHA256 resolv-retry infinite compress lzo nobind persist-key persist-tun mute-replay-warnings verb 3

ipp.txt
Quote:

clientIP10,10.8.0.10 clientIP11,10.8.0.11 clientIP12,10.8.0.12 clientIP13,10.8.0.13 clientIP14,10.8.0.14 clientIP15,10.8.0.15 clientIP16,10.8.0.16 clientIP17,10.8.0.17 clientIP18,10.8.0.18 clientIP19,10.8.0.19 clientIP20,10.8.0.20

The file clientIP10 for static ip contain
Quote:

ifconfig-push 10.8.0.10 10.8.0.1