[yocto] How do I write a yocto/bitbake recipe to replace the default vsftpd.conf file with my own file?

[Bacheh Karaji]

Hi,I want to replace the default vsftpd.conf file with my own file!My bitbake file looks following:
bbexample_1.0.bb    DESCRIPTION = "Configuration and extra files for TX28"    LICENSE = "CLOSED"    LIC_FILES_CHKSUM = ""        S = "${WORKDIR}"        SRC_URI += " \        file://ld.so.conf \        file://vsftpd.conf \        file://nginx/nginx.conf \        file://init.d/myscript.sh"        inherit allarch        do_install () {        install -d ${D}${sysconfdir}        install -d ${D}${sysconfdir}/nginx        install -d ${D}${sysconfdir}/init.d        rm -f ${D}${sysconfdir}/ld.so.conf        rm -f ${D}${sysconfdir}/vsftpd.conf        install -m 0755 ${WORKDIR}/ld.so.conf ${D}${sysconfdir}        install -m 0755 ${WORKDIR}/vsftpd.conf ${D}${sysconfdir}        install -m 0755 ${WORKDIR}/nginx/nginx.conf ${D}${sysconfdir}/nginx/        install -m 0755 ${WORKDIR}/init.d/myscript.sh ${D}${sysconfdir}/init.d/    }
 But, the file could not be replaced! What is wrong?
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