Generate an OpenVPN static key and save it to static.key:
openvpn --genkey --secret static.key
The key looks like this:
# # 2048 bit OpenVPN static key # -----BEGIN OpenVPN Static key V1----- 97aae54ce3e22128c0efba9043a6ba07 03dc5a68399a7e7f65ab6d7cdc390729 a1f72e665fe7cf300edccb1555df56ff 3d2386942c7b78cf1676c5734834ea18 2c2ba33523e3278a84efe168dd160fd4 3c0205a0335765b80881cfb915e9b3de 097a63ee5321a31540c51a628ab95d0e 4f40657351125526120a1a83ec8af043 3ddbb859a6c8e2d36797ba5a983dd223 5ecea38941b8af992492887e6d361ccc a41f1a3993f2c24011b2a3026b71c82d 12d301cb346de19dcaa550886b5dd0c0 9b4d6bd0ca7415a42e4ffa10fe39659e e9ad0ff1edcfa2d62c3e3db2834f0da5 fe8e4c332325a195c537551a6f1a0ff5 c5bd5d7b038c7a9df9c8d28cb33ef4b0 -----END OpenVPN Static key V1-----