user69328: I have set default paytxfee of 0.001 in bitcoin.conf file. I have updated paytxfee value via bitcoin-cli paytxfee 0.1 when I restarted bitcoin core value reset back to 0.001. is there is anyway i can set fee permanently.

user208: You can make it persistent by adding a line paytxfee=0.1 to your bitcoin.conf file.
You cannot make bitcoind persist the result of the paytxfee RPC.

user64890: You can do one thing when running bitcoin-cli paytxfee 0.1 command, you can run command to update value of paytxfee inside bitcoind.conf file.
like this:
bitcoin-cli paytxfee NEW_AMOUNT && sed -i 's/paytxfee=OLD_AMOUNT/paytxfee=NEW_AMOUNT/g' ~/.bitcoin/bitcoin.conf 

This will set fee for current session also when you restart bitcoin core price will not alter. 

69328: <p>I have set default <code>paytxfee</code> of 0.001 in <code>bitcoin.conf</code> file. I have updated <code>paytxfee</code> value via <code>bitcoin-cli paytxfee 0.1</code> when I restarted bitcoin core value reset back to 0.001. is there is anyway i can set fee permanently.</p>
 208: <p>You can make it persistent by adding a line <code>paytxfee=0.1</code> to your <code>bitcoin.conf</code> file.</p>

<p>You cannot make <code>bitcoind</code> persist the result of the <code>paytxfee</code> RPC.</p>
 64890: <p>You can do one thing when running <code>bitcoin-cli paytxfee 0.1</code> command, you can run command to update value of <code>paytxfee</code> inside <code>bitcoind.conf</code> file.</p>

<p>like this:</p>

<pre><code>bitcoin-cli paytxfee NEW_AMOUNT &amp;&amp; sed -i 's/paytxfee=OLD_AMOUNT/paytxfee=NEW_AMOUNT/g' ~/.bitcoin/bitcoin.conf 
</code></pre>

<p>This will set fee for current session also when you restart bitcoin core price will not alter. </p>
