If your vps does not come with swap, you can easily add swap to centos 7 following this guide: https://www.digitalocean.com/community/tutorials/how-to-add-swap-on-centos-7
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If your vps does not come with swap, you can easily add swap to centos 7 following this guide: https://www.digitalocean.com/community/tutorials/how-to-add-swap-on-centos-7