Tag Archives: Server knowledge

Configuration: error:!! OpenSSL is not properly installed on your system

Project scenario:

In Linux system, use the command to decompress and install the keepalived source package.

Problem Description:

To install the keepalived source code package, you have run the following command:

tar -xzvf keepalived-2.2.2.tar.gz
cd keepalived-2.2.2
./configure --prefix=/usr/local/keepalived
yum -y install gcc
./configure --prefix=/usr/local/keepalived

The third command run result error, has been solved (solution), in the fifth line to re run the command error, the error message is:

configure: error:
  !!! OpenSSL is not properly installed on your system. !!!
  !!! Can not include OpenSSL headers files.

Cause analysis:

The main reason for this error is the lack of header files. You only need to install OpenSSL and OpenSSL devel.

Solution:

To install OpenSSL and OpenSSL devel:

yum -y install openssl openssl-devel

Rerun the command ./configure -- prefix =/usr/local/kept , the command runs normally, and the problem is solved.

If there are other errors, please refer to:
configure: error: no acceptable C compiler found in $path error resolution
warning - this build will not support IPVS with IPv6

Configuration: error: no acceptable C compiler found in $path

Project scenario:

In Linux system, use the command to decompress and install the keepalived source package.

Problem Description:

To install the keepalived source code package, you have run the following command:

tar -xzvf keepalived-2.2.2.tar.gz
cd keepalived-2.2.2
./configure --prefix=/usr/local/keepalived

The first two commands run normally, and the third command runs as follows:

checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /usr/bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether make supports nested variables... (cached) yes
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for gcc... no
checking for cc... no
checking for cl.exe... no
configure: error: in `/root/software/keepalived-2.2.2':
configure: error: no acceptable C compiler found in $PATH

Cause analysis:

The main reason for this error is that there is no c compiler.

Solution:

To install the C compiler:

yum -y install gcc

Rerun the command ./configure -- prefix =/usr/local/kept , the command runs normally, and the problem is solved.

If there are other errors, please refer to:
configure: error:!! OpenSSL is not properly installed on your system.!! Error resolution
warning - this build will not support IPVS with IPv6

Warning – this build will not support IPVS with IPv6

Project scenario:

In Linux system, use the command to decompress and install the keepalived source package.

Problem Description:

To install the keepalived source code package, you have run the following command:

tar -xzvf keepalived-2.2.2.tar.gz
cd keepalived-2.2.2
./configure --prefix=/usr/local/keepalived
yum -y install gcc
./configure --prefix=/usr/local/keepalived
yum -y install openssl openssl-devel
./configure --prefix=/usr/local/keepalived

The third command run result error, solved (solution), the fifth command run result error, solved (solution), in the seventh line re run the command error, the warning message is:

*** WARNING - this build will not support IPVS with IPv6. Please install libnl/libnl-3 dev libraries to support IPv6 with IPVS.

Cause analysis:

The main reason for this error is the lack of libnl core library. Just install libnl and libnl devel.

Solution:

Install libnl and libnl devel:

yum -y install libnl libnl-devel

Rerun the command ./configure -- prefix =/usr/local/kept , the command runs normally, and the problem is solved.

If there are other errors, please refer to:
configure: error: no acceptable C compiler found in $path error resolution
configure: error:!! OpenSSL is not properly installed on your system.!! Error resolution

UnhandledPromiseRejectionWarning: MongoError: not authorized on elm to execute comman

Error in starting node project

UnhandledPromiseRejectionWarning: MongoError: not authorized on elm to execute command { insert: “hongbaos”, ordered: false, $db: “elm” }

The reason is that you do not have permission to connect to the database

The reason is that the database mongo.conf There is an auth = true solution

1. Comment out auth = true

2. Enter adimn to set the user name and password, and use the user name and password to access the database

Switch use admin before creating user

db.createUser(
	{
		user:"root",
		pwd:"123456",
		roles:[{role:"root",db:"admin"}]
	}
);