Inform here 'acme.sh --help; cat /var/log/acme.sh/acme.sh.log'.
[root@server~]# acme.sh --help; cat /var/log/acme.sh/acme.sh.log
https://github.com/Neilpang/acme.sh
v2.2.4
Usage: acme.sh command ...[parameters]....
Commands:
--help, -h Show this help message.
--version, -v Show version info.
--install Install acme.sh to your system.
--uninstall Uninstall acme.sh, and uninstall the cron job.
--issue Issue a cert.
--installcert Install the issued cert to apache/nginx or any other server.
--renew, -r Renew a cert.
--renewAll Renew all the certs
--revoke Revoke a cert.
--installcronjob Install the cron job to renew certs, you don't need t o call this. The 'install' command can automatically install the cron job.
--uninstallcronjob Uninstall the cron job. The 'uninstall' command can d o this automatically.
--cron Run cron job to renew all the certs.
--toPkcs Export the certificate and key to a pfx file.
--createAccountKey, -cak Create an account private key, professional use.
--createDomainKey, -cdk Create an domain private key, professional use.
--createCSR, -ccsr Create CSR , professional use.
Parameters:
--domain, -d domain.tld Specifies a domain, used to issue, renew or revoke etc.
--force, -f Used to force to install or force to renew a cert immediately.
--staging, --test Use staging server, just for test.
--debug Output debug info.
--webroot, -w /path/to/webroot Specifies the web root folder for web root m ode.
--standalone Use standalone mode.
--apache Use apache mode.
--dns [dns_cf|dns_dp|dns_cx|/path/to/api/file] Use dns mode or dns api.
--keylength, -k [2048] Specifies the domain key length: 2048, 3072, 4096, 8192 or ec-256, ec-384.
--accountkeylength, -ak [2048] Specifies the account key length.
These parameters are to install the cert to nginx/apache or anyother server af ter issue/renew a cert:
--certpath /path/to/real/cert/file After issue/renew, the cert will be copied to this path.
--keypath /path/to/real/key/file After issue/renew, the key will be copied to this path.
--capath /path/to/real/ca/file After issue/renew, the intermediate cert wil l be copied to this path.
--fullchainpath /path/to/fullchain/file After issue/renew, the fullchain cert will be copied to this path.
--reloadcmd "service nginx reload" After issue/renew, it's used to reload the server.
--accountconf Specifies a customized account config file.
--home Specifies the home dir for acme.sh .
--certhome Specifies the home dir to save all the certs .
--useragent Specifies the user agent string. it will be saved for future use too.
--accountemail Specifies the account email for registering, Only valid for the '--install' command.
--accountkey Specifies the account key path, Only valid f or the '--install' command.
--days Specifies the days to renew the cert when us ing '--issue' command. The max value is 80 days.
[Wed May 18 11:55:15 EEST 2016] Skip register account key
[Wed May 18 11:55:15 EEST 2016] Creating csr
[Wed May 18 11:55:15 EEST 2016] Multi domain='DNS:www.******.**,DNS:cp.*****.**,DNS:webmail.*****.**'
unable to load Private Key
31489:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:647:Expec ting: ANY PRIVATE KEY
[Wed May 18 11:55:15 EEST 2016] Create CSR error.
[root@server~]#
acme.sh.log shows only last try

It deletes old logs